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# AMC 8 2020 Problem 18 | Area Problem

Try this beautiful Problem based on area from AMC 8 2020.

## Probability Problem - AMC 8 2020 Problem 18

Rectangle $A B C D$ is inscribed in a semicircle with diameter $\overline{F E}$, as shown in the figure. Let $D A=16$, and let $F D=A E=9$. What is the area of $A B C D$ ?

• 240
• 248
• 256
• 264
• 272

Area

Semi circle

Symmetry

## Suggested Book | Source | Answer

AMC 8 2020 Problem 13

240

## Try with Hints

Try to find the diameter of the semicircle. So the diameter will be,

The diameter of the semicircle is $9+16+9=34$, so $O C=17$. By symmetry, $O$ is the midpoint of AD,So, $AO=OD=\frac{16}{2}=8$.

Now, apply Pythagorean Theorem to find CD,

SO the area of ABCD will be=$AD \times CD$

AMC-AIME Program at Cheenta

## Subscribe to Cheenta at Youtube

Try this beautiful Problem based on area from AMC 8 2020.

## Probability Problem - AMC 8 2020 Problem 18

Rectangle $A B C D$ is inscribed in a semicircle with diameter $\overline{F E}$, as shown in the figure. Let $D A=16$, and let $F D=A E=9$. What is the area of $A B C D$ ?

• 240
• 248
• 256
• 264
• 272

Area

Semi circle

Symmetry

## Suggested Book | Source | Answer

AMC 8 2020 Problem 13

240

## Try with Hints

Try to find the diameter of the semicircle. So the diameter will be,

The diameter of the semicircle is $9+16+9=34$, so $O C=17$. By symmetry, $O$ is the midpoint of AD,So, $AO=OD=\frac{16}{2}=8$.

Now, apply Pythagorean Theorem to find CD,

SO the area of ABCD will be=$AD \times CD$

AMC-AIME Program at Cheenta

## Subscribe to Cheenta at Youtube

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