Deltoid Practice Problems: Kite Properties & Solutions

Master deltoid geometry with step-by-step practice problems. Learn kite properties, diagonal calculations, area formulas, and perimeter solutions.

📚What You'll Master in This Deltoid Practice Session
  • Identify deltoids using the two pairs of equal adjacent sides rule
  • Calculate deltoid area using the diagonal product formula divided by two
  • Find missing angles using base angle equality and vertex angle properties
  • Apply Pythagorean theorem to solve diagonal length problems in kites
  • Determine perimeter by adding all four sides of the deltoid
  • Distinguish between convex and concave deltoid types in geometric problems

Understanding Deltoid

Complete explanation with examples

The Deltoid and Everything You Need to Know to Verify It

What is a Kite or Deltoid?

In geometry, a deltoid is defined as a quadrilateral consisting of 2 2 isosceles triangles that share a common base.

So, what is the identification of a deltoid in the family of quadrilaterals?

A quadrilateral that has 2 pairs of equal adjacent sides

Example:

If given : AD=AB,DC=BC AD=AB,DC=BC

Then: ABCD ABCD is a deltoid by definition.

  • 2 isosceles triangles with a common base form a deltoid.
  • The sum of the angles in the deltoid is 360° 360° degrees.
  • The area of the deltoid contains the number of quadrilaterals that cover the selected parts of the plane.
  • The perimeter of the deltoid is the length of the thread with which we border the outline of the deltoid and is measured in units of length in meters or cm.
3 - Convex Kite

Detailed explanation

Practice Deltoid

Test your knowledge with 49 quizzes

Given the deltoid ABCD

Find the area

555161616AAADDDCCCBBB

Examples with solutions for Deltoid

Step-by-step solutions included
Exercise #1

Look at the deltoid in the figure:

777444

What is its area?

Step-by-Step Solution

Let's begin by reminding ourselves of the formula for the area of a kite

Diagonal1×Diagonal22 \frac{Diagonal1\times Diagonal2}{2}

Both these values are given to us in the figure thus we can insert them directly into the formula:

(4*7)/2

28/2

14

Answer:

14

Video Solution
Exercise #2

Look at the deltoid in the figure:

555666

What is its area?

Step-by-Step Solution

To solve the exercise, we first need to know the formula for calculating the area of a kite:

It's also important to know that a concave kite, like the one in the question, has one of its diagonals outside the shape, but it's still its diagonal.

Let's now substitute the data from the question into the formula:

(6*5)/2=
30/2=
15

Answer:

15

Video Solution
Exercise #3

ACBD is a deltoid.

AD = AB

CA = CB

Given in cm:

AB = 6

CD = 10

Calculate the area of the deltoid.

666101010AAACCCBBBDDD

Step-by-Step Solution

To solve the exercise, we first need to remember how to calculate the area of a rhombus:

(diagonal * diagonal) divided by 2

Let's plug in the data we have from the question

10*6=60

60/2=30

And that's the solution!

Answer:

30

Video Solution
Exercise #4

ABDC is a deltoid.

AB = BD

DC = CA

AD = 12 cm

CB = 16 cm

Calculate the area of the deltoid.

161616121212CCCAAABBBDDD

Step-by-Step Solution

First, let's recall the formula for the area of a rhombus:

(Diagonal 1 * Diagonal 2) divided by 2

Now we will substitute the known data into the formula, giving us the answer:

(12*16)/2
192/2=
96

Answer:

96 cm²

Video Solution
Exercise #5

Shown below is the deltoid ABCD.

The diagonal AC is 8 cm long.

The area of the deltoid is 32 cm².

Calculate the diagonal DB.

S=32S=32S=32888AAABBBCCCDDD

Step-by-Step Solution

First, we recall the formula for the area of a kite: multiply the lengths of the diagonals by each other and divide the product by 2.

We substitute the known data into the formula:

8DB2=32 \frac{8\cdot DB}{2}=32

We reduce the 8 and the 2:

4DB=32 4DB=32

Divide by 4

DB=8 DB=8

Answer:

8 cm

Video Solution

Frequently Asked Questions

How do you identify if a quadrilateral is a deltoid or kite?

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A quadrilateral is a deltoid (kite) if it has two pairs of equal adjacent sides. For example, if AB = AD and BC = DC, then ABCD is a deltoid. This creates two isosceles triangles sharing a common base.

What is the formula for calculating the area of a deltoid?

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The area of a deltoid equals (d₁ × d₂) ÷ 2, where d₁ and d₂ are the lengths of the two diagonals. The diagonals are perpendicular to each other, making this formula applicable to all kite shapes.

Why are the base angles equal in a deltoid?

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Base angles are equal because a deltoid consists of two congruent isosceles triangles sharing a common base. In isosceles triangles, the base angles are always equal, so corresponding base angles in the deltoid are also equal.

How do you find the perimeter of a kite shape?

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Add all four sides of the deltoid: Perimeter = AB + BC + CD + DA. Since adjacent sides are equal in pairs, you can also use: Perimeter = 2(side₁ + side₂), where side₁ and side₂ are the lengths of the different adjacent sides.

What are the key properties of deltoid diagonals?

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Deltoid diagonals have three main properties: 1) They are perpendicular to each other, 2) The main diagonal bisects both vertex angles, 3) The main diagonal bisects the secondary diagonal at their intersection point.

What's the difference between convex and concave kites?

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A convex kite has both diagonals inside the shape, creating a traditional kite appearance. A concave kite has one diagonal extending outside the shape, creating a bowl-like or dart appearance with an inward-pointing vertex.

How do you solve for missing diagonal lengths in deltoid problems?

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Use the Pythagorean theorem in the right triangles formed by the perpendicular diagonals. If you know the area and one diagonal, use Area = (d₁ × d₂) ÷ 2 to find the other diagonal. The diagonal intersection creates four right triangles.

Can a rhombus or square be considered a special type of deltoid?

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Yes, both rhombus and square are special cases of deltoids. A rhombus is an equilateral kite where all sides are equal. A square is a kite with equal sides and right angles, maintaining the two pairs of equal adjacent sides property.

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