Little brother needs math help and I'm busy.
Which equation could be used to find the perimeter of an isosceles triangle, with two sides 13 cm long, a base 10 cm long and a height of 12 cm?

A.
P = (10 × 12) ÷ 2

B.
P = 2 × 13 + 10

C.
P = 13 + 10 + 12

D.
P = 2 × 10 + 13
he will be typing

Question

Little brother needs math help and I'm busy.
Which equation could be used to find the perimeter of an isosceles triangle, with two sides 13 cm long, a base 10 cm long and a height of 12 cm?	
 
 A.
P = (10 × 12) ÷ 2
 
 B.
P = 2 × 13 + 10
 
 C.
P = 13 + 10 + 12
 
 D.
P = 2 × 10 + 13
he will be typing

anonymous · Answer

To find the perimeter of any object or shape, you simply add all the sides together. Since you know that there are 2 sides the same size you can multiply that number times 2 and add the other number. 
So P= 2 x 13 + 10
They just threw in that extra number to trick you into thinking you need it, the height is not relevant.