are this angles

yes

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are this angles

yes

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Angle A +Angle B + Angle C = 180

==> (angle B+63) + angle B + (angle B - 18) = 180

OR 3 x angle B = 180 - 63 + 18 = 135

OR angle B = 135 / 3 = 45

Angle A +Angle B + Angle C = 180

(Angle B+63) + Angle B + (Angle B - 18) = 180

3 × Angle B = 180 - 63 + 18 = 135

Angle B = 135 / 3

Angle B = 45