im failing Geometry if anyone is good at Geometry and want to help me i attached 5 problems i greatly appreciate anyone that helps

x = 12

Step-by-step explanation:

Here we go!

What we know:

So 7x and 8x are part of a same side interior angle. meaning, they add up to 180°!

Combine like terms

Divide 15 from both sides

Let's check our work:

plug in x

7(12) + 8(12) = 180

multiply

84 + 96 = 180

add

180 = 180

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

13cm

step-by-step explanation:

(apex)