From above Fig., if ∠a is 120°, can you figure out the measurements of ∠b, ∠c and ∠d. Class 7

From above Fig., if ∠a is 120°, can you figure out the measurements of ∠b, ∠c and ∠d. Class 7

Question 1.

From above Fig., if ∠a is 120°, can you figure out the measurements of ∠b, ∠c and ∠d, without drawing and measuring them? Class 7

Solution:

∠b = 60°; ∠c = 120° and ∠d = 60°

Question 2.

Is this always true for any pair of intersecting lines? Class 7

Solution:

Yes.

Question 3.

List all the linear pairs and vertically opposite angles you observe in Fig.: Class 7

Solution:

Linear Pairs : ∠a and ∠b, ∠b and ∠c, ∠c and ∠d and ∠d and ∠a.

Pairs of vertically opposite angles : ∠a and ∠c, ∠b and ∠d.