Question

please answer this question ​

Answer 1

Answer:

angle AMB & AMC are in linear pair

And linear pair = 180°

If

AMB + AMC = 180°

90° + AMC = 180°

AMC = 180°-90°

AMC = 90°

Answer 2

Step-by-step explanation:

let angle BAM=x the angle A=2x, angleA+angleB+angleC=180, since, A=B=C therefore, 2x+2x+2x=180, x=30, angle B=2x=2×30=60, in triangleAMB, angleBAM+angleB+angleAMB=180 30+60+AMB=180, therefore, angleAMB=90=angleAMC, hence proved