Page 159 - Start Up Mathematics_7

Answer in One Word or a Line

1. When are two angles said to be supplementary?

2. What are two adjacent supplementary angles known as?
3. When two parallel lines are cut by a transversal, how many pairs of alternate interior angles
are formed? What about the corresponding angles?

4. Can two obtuse angles form a linear pair?
5. Two angles have a common vertex and a common arm. Can we say they are adjacent?

let’s evaluate
C
1. In the given figure, what value of x will
make AOB a straight line?

3x + 5°
A 2x – 25° B
O

l
1
2. Two lines l and m intersect at a point O. If ∠x = 100°, O
find the measure of angles ∠1, ∠2 and ∠3. 2 3
x
m

3. In the given figure, l || m. If s and t are two transversals as shown, find the values of x and y.

t
s
120° y
l

x 65°
m

4. In the given figure, l || m and PQ || RS. If ∠1 = 100°, find the measures of the remaining
angles.

P

1
l
3 2
Q
R

6 4
m
5

S

151