Question

Someone help me. Not good at math

Answer 1

perimeter = add all 3 sides 13+13+10 = 36 cm

 for area you need to find the height of the triangle, which is the red dotted line

to do that use the Pythagorean Theorem

a^2 + B^2= c^2

a^2 = height

a^2 +5^2 = 13^2

a^2 +25 = 169

a^2 = 169-25 = 144

a=square root(144) = 12

 so the height is 12

area = 1/2 h x b = 1/2 x 12 x 10 = 1/2x 120 = 60

area = 60 cm^2

 cost is $4 per square cm

 there is 60 square cm in the triangle so multiply 60 x 4 = $240