Question

1. In a triangle ABC, if angleA +angleB = 65° and angleB + angleC = 140°, then find the measure of angleB.​

Answer 1

If angle A + Angle B = 65°

then 65° ÷ 2

= 32.5°

if Angle B + Angle C = 140°

so 140 ÷ 2

= 70 °

32.5° + 70°

= 102.5° Is the measure of Angle B

Answer 2

Answer: if these angles are belongs to triangle then

A+B+C=180----(1)

A+B=65----(2)

B+C=140---(3)

add (2) and (3)

u get A+2B+C=205---(4)

subtract (1) from (4)

B=25

put B =25 in (3)

C=115

put B in (2)

A=40

therefore

A=40,B=25, C=115