Question

In a triangle ABC, if angle B=70,angle C=45, find angle A
please say the answer I will mark u as brainliest....​

Answer 1

Answer:

Angle A = x°

Angle B = 70°

Angle C = 45°

A + B + C = 180°

x + 70 + 45 = 180

x = 180 - (70 + 45)

= 180 - 115

= 75°

Answer 2

Answer :-

The measure of ∠A is 65°.

Step-by-step explanation:

To Find :-

• The measure of ∠A of ∆ABC

★ Solution

Given that,

• The measure of ∠B = 70°
• The measure of ∠C = 45°

We know,

Sum of three Interior angles of ∆ = 180°

• ∠A + ∠B + ∠C = 180°

∴ ∠A + 70° + 45° = 180°

⇒ ∠A + 70 + 45 = 180

⇒ ∠A + 115 = 180

⇒ ∠A = 180 - 115

⇒ ∠A = 65°

Hence,

The measure of ∠A is 65°.

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V E R I F I C A T I O N :-

• ∠A + ∠B + ∠C = 180°

By putting the values of [∠A, ∠B & ∠C] in L.H.S and simplifying :-

⇒ 65 + 70 + 45

⇒ 110 + 70

⇒ 180

∴ L.H.S = R.H.S

Hence, Verified!