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3x + 5 + 4x - 13 = 90'
7x - 8 = 90'
7x = 98'
x = 14'
<CBD = 3x + 5' = 3(14) + 5 = 42' + 5' = 47'
maka
90 = 4x - 13 + 3x + 5
90 = 7x - 8
90 + 8 = 7x
98 = 7x
x = 14⁰
besar CBD adalah
3x+5
3(14)+5
47⁰ (D)