Answer:
76 =R
Explanation:
Since the two sides are equal, this is an isosceles triangle. The means angles S and T are equal. We know that the sum of the three angles are 180 in a triangle.
R + S + T = 180
3x+1 + 2x+2 + 2x+2 = 180
Combine like terms
7x+5 = 180
Subtract 5 from each side
7x+5-5= 180-5
7x = 175
Divide by 7
7x/7 = 175/7
x=25
We want to find R
3x+1 = R
3(25)+1 = R
75+1 =R
76 =R