Question

In an isosceles Δ ABC with BC=AC, ∠C=80 degree then ∠B will be

1.70 degree

2.40 degree

3.50 degree

4.60 degree

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Answer 1

Answer:

20 degree is the correct answer

Step-by-step explanation:

by angle sum property of triangle =180

Answer 2

Answer:

50 deg

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Step-by-step explanation:

first, we need to make a diagram of what we need to find. (refer given attachment)

facts we need to remember:

• sum of all angles of the triangle is 180 deg.
• if the two sides are equal, the corresponding angles are also equal.

so, we can frame the following statements to solve this.

• angle B = angle A since they are the corresponding angles.
• angle C = 80 deg
• angles C+B+A = 180 deg

so, we use this information t solve thie question.

C + B + A = 180 deg

80 + B + B = 180 deg

2B = 180 - 80

B = 100/2

B = 50 deg