Perimeter of the triangle is 60.
A perimeter of a triangle can be found using the following:
1) measurement of 3 sides are given:
P = a + b + c
2) 2 sides of a right angle triangle is given:
a² + b² = c² ; P = a + b + c
3) 2 sides of a triangle is given with the measurement of an angle.
c² = a² + b² - 2ab(cos(C)).
Since, only the measurement of 2 sides is given, we can assume that the triangle is a right-angled triangle.
c² = a² + b²
c² = 20² + 15²
c² = 400 + 225
c² = 625
c = √625
c = 25
P = a + b + c
P = 20 + 15 + 25
P = 60
