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Question 12 Marks
The measures of two angles of a triangle are 72° and 58°. Find the measure of the third angle.
Answer
The measures of two angles of a triangle are 72° and 58°.
But measure of three angles of a triangle is 180°.
Third angle will be = 180 - (72° + 58°)
= 180° - 130°= 50°
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Question 22 Marks
Take three non-collinear points A, B and C on a page of your notebook. Join AB, BC and CA. What figure do you get?Name:
  1. The side opposite to $\angle\text{C}$.
  2. The angle opposite to the side BC.
  3. The vertex opposite to the side CA.
  4. The side opposite to the vertex B.
Answer
A, B and C are three non-collinear points in a plane. AB, BC and CA are joined.
  1. The side opposite $\angle\text{C}$ is AB.
  2. The angle opposite to the side BC is $\angle\text{A}.$
  3. The vertex opposite to the side CA is B.
  4. The side opposite to the vertex B is CA.
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