Question

In triangle abc,ab=ac and angle a =40°then find angle c

Answer 1

Step-by-step explanation:

first it is isosceles triangle as two sides are equal.

two side are equal and angles opposite to A are equal..

total sum of all angle180.

take the other angle x.

40+2x=180

2x=180-40

2x=140

x=140/2

x=70

Therefore angle C and B is 70⁰.

hope it helps you.

Answer 2

Answer:

70

Step-by-step explanation:

• In triangle ABC,
• A+B+C=180............1
• AB = AC,so it is an isosceles triangle
• therefore, angle B = angle C.........2
• angle A = 40°
• let angle B = x
• from equation 2, angle C = x
• substituting the value of angles A,B and C in equation 1
• therefore, 40+x+x = 180
• 2x = 180-40
• 2x = 140
• x = 140/2
• x = 70
• therefore angle C = 70

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