Calculate Side Length AC in Deltoid with Area 48 cm² and Diagonal 6 cm

Question

Shown below is the deltoid ABCD.

Diagonal DB = 6

The area of the deltoid is 48 cm².

Calculate the side AC.

S=48S=48S=48666DDDAAABBBCCC

Video Solution

Solution Steps

00:00 Calculate AC
00:03 We'll use the formula for calculating the area of a kite
00:07 (diagonal times diagonal) divided by 2
00:12 We'll substitute appropriate values and solve for AC
00:22 We'll multiply by 2 to eliminate the fraction
00:35 Isolate AC
00:43 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Use the formula for the area of a deltoid.

  • Step 2: Substitute the known values into the formula.

  • Step 3: Solve for the unknown diagonal AC AC .

Now, let's work through each step:

Step 1: The area of a deltoid is given by the formula:

Area=12×AC×DB \text{Area} = \frac{1}{2} \times AC \times DB

Step 2: Substitute the given values into the formula:

48=12×AC×6 48 = \frac{1}{2} \times AC \times 6

Step 3: Solve for AC AC .

First, simplify the equation:

48=3×AC 48 = 3 \times AC

Now, divide both sides by 3 to isolate AC AC :

AC=483=16 AC = \frac{48}{3} = 16

Therefore, the solution to the problem is AC=16cm AC = 16 \, \text{cm} .

Answer

16