Calculate Trapezoid Height: Area 20 cm² with 10 cm Base Sum

Question

The trapezoid ABCD has an area equal to 20 cm².

The sum of its bases is 10 cm.

What is the height of the trapezoid?

S=20S=20S=20AAABBBCCCDDD

Video Solution

Solution Steps

00:00 Find the height of the trapezoid
00:03 We'll use the formula for calculating the area of a trapezoid
00:06 (Sum of bases(AB+DC) multiplied by height(H)) divided by 2
00:14 We'll substitute appropriate values and solve for H
00:28 Let's isolate H
00:37 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we'll use the trapezoid area formula:

Given:

  • Area, S=20cm2 S = 20 \, \text{cm}^2
  • Sum of bases, b1+b2=10cm b_1 + b_2 = 10 \, \text{cm}

The formula for the area of a trapezoid is:

S=(b1+b2)2×h S = \frac{(b_1 + b_2)}{2} \times h

Substituting the known values into the formula, we have:

20=102×h 20 = \frac{10}{2} \times h

Simplifying the equation:

20=5×h 20 = 5 \times h

Solving for h h , we divide both sides by 5:

h=205=4cm h = \frac{20}{5} = 4 \, \text{cm}

Therefore, the height of the trapezoid is 4cm 4 \, \text{cm} .

Answer

4 cm