An asteroid hit the Earth and created a huge crater. Engineers and scientists have measured around the crater and found it to be 79.5 miles. How much of the Earth's surface was affected by the crater impact? (Round your answer to the nearest tenth) miles squared

503.2 mi²

Step-by-step explanation:

The amount of impact could be obtained by finding the area of the Circumference ; which is the measure of the crater :

Circumference, C = 79.5

Area of circle = πr²

Radius, r :

From ; C = 2πr

79.5 = 2 * 3.14 * r

79.5 = 6.28r

r = 79.5 /6.28

r = 12.659235

Area of circle, A : πr²

A = 3.14 * 12.659235^2

A = 503.2045646656065

A = 503.2 mi²

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct