Find the perimeter of an isosceles triangle with a vertical angle of 100° and a base of 25cm. Given your answer in two decimal places.

Question

magbak · Answer

@Katieholmes use this http://www.mathportal.org/calculators.php

campbell_st · Answer

use the law of sines|dw:1406837470808:dw|

find the base angles of the isosceles triangles 

then 

$$\frac{x}{\sin(40)} = \frac{25}{\sin(100)}$$

just solve for x. 

The perimeter will be 

P = 2x + 25

hope it helps

anonymous · Answer

both really helped thank you guys! @campbell_st @magbak

magbak · Answer

NO BUT @campbell_st is  better than me

anonymous · Answer

Perimeter p = 57.64 http://www.triangle-calculator.com/?what=iso&a=C%3D100+b%3D25&submit=Solve

anonymous · Answer

thank you too! @triangleguru