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7.segitiga ABC sama kaki
<A= <B
<A+ <B + <C = 180°
segitiga BCA sama kaki
< A= < C = 64°
a. <CAB = < CBA = (180 - 64): 2 = 58°
cari nilai x dan y :
( x +4) + < ADB + <A = 180°
x + 4 + 90° + 64° = 180°
x + 158 = 180°
x = 180 - 158
x = 22

2y - 5 + < CDB + <C = 180°
2y -5 + 90° + 64° = 180°
2y + 149= 180°
2y = 180° - 149°
y = 31/2
y = 15,5

b.x + 2y
22+ 2(15,5) = 53

c. y= 15,5