The last one: the arc AB is a semicircle.
a semicircle is 180 degrees
The angle of x is 71°
Because the triangle in isosceles the two bottom angles will have the same measure.
The angles of a triangle will add to 180° so you subtract 38 and divide by 2.
L + S = 13
L = S + 4
S + 4 + S = 13
2S = 9
S = 9/2 =
S = 4.5 ft
L = 4.5 + 4
L = 8.5 ft
