Help with the Area of a circle

A = 201.06 units²

A = 78.54 units²

Step-by-step explanation:

Formula for area of a circle = πr²

✔️Area of the first circle:

r = ½(d) = ½(16)

r = 8

Area = π*8² = π*64

Area = 201.06 units²

✔️Area of the second circle:

r = 5

Area = π*5²

= π*25

Area = 78.54 units²

m∠a is 90°

m∠b is 40°

answer: (-8,4) are the coordinates of a

step-by-step explanation:

let the side of square abcd is x .

thus the area of square abcd is .

now, by the diagram area of triangle ead= 1/2 × ea × ad = 1/2 × ea × x

( because ad is the side of square)

and, according to the question,

the areas of square abcd and right ead are equal.

⇒

⇒ea=2x

thus, ea: ab=2: 1

therefore, point a divides line segment eb into the ratio 2: 1.

⇒ by sectional formula coordinates of a are,

=

=

=(-8, 4)

thus the coordinates of a are (-8,4)