Calculate Deltoid Diagonal BD: Given Area 44 cm² and AC = 11 cm

Question

Given the deltoid ABCD

Side length AC equals 11 cm

The area of the deltoid is equal to 44 cm².

Find the length of the side BD

S=44S=44S=44111111AAABBBCCCDDD

Video Solution

Solution Steps

00:00 Find BD
00:03 We'll use the formula for calculating the area of a kite
00:07 (diagonal times diagonal) divided by 2
00:10 We'll substitute appropriate values according to the given data and solve for BD
00:20 We'll isolate BD by multiplying by the reciprocal
00:39 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we'll use the formula for the area of a deltoid:

  • Area=12×d1×d2 \text{Area} = \frac{1}{2} \times d_1 \times d_2

Let's work through the steps:

Step 1: Write down the formula for the area of the deltoid. The area S S is given as:

44=12×11×BD 44 = \frac{1}{2} \times 11 \times BD

Step 2: Rearrange this equation to solve for the unknown diagonal BD BD :

44×2=11×BD 44 \times 2 = 11 \times BD

88=11×BD 88 = 11 \times BD

Step 3: Divide both sides by 11 to find the length of BD BD :

BD=8811=8 BD = \frac{88}{11} = 8 cm

Therefore, the solution to the problem is BD=8 BD = 8 cm.

Answer

8 8 cm