Math, asked by amritpandey4321, 7 months ago

prove that the sum of all angles of a triangle is two right angles​

Answers

Answered by saahiv008
1

Answer:

From External Angle of Triangle equals Sum of other Internal Angles: ∠ACD=∠ABC+∠BAC. ... But from Two Angles on Straight Line make Two Right Angles, ∠ACB+∠ACD equals two right angles. So by Euclid's First Common Notion, ∠ABC+∠BAC+∠ACB equals two right angles

Step-by-step explanation:

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Answered by agarwalpooja0246
1

Step-by-step explanation:

As we know that the sum of all the three angles of a triangle is 180°and a right angle is 90° .

Number of right angles in a triangle = 180° / 90° =2

Hence proved.

Say X= smaller acute angle in right triangle

4X= larger acute angle

90° = right angle

x+4x+90°=180

5x=90°

x=18°

4x=72°

Acute angles are 18°and 72°

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