Question

(it)
(iii)
7. (a) In the fig. (1) given below, DE || BC. Find the value of x.
(b) In the fig. (ii) given below, ZP = 3y. Find the values of x and y.
(c) In the fig. (iii) given below, find the size of each lettered angle.
Р
100°
I
С
E
95°
1430
Y
80°
52°
60°
50°
x
R
Dm
B
Q
А
(iii)
und the nther twn angles are equal.
no​

Answer 1

Step-by-step explanation:

Conclusion: Mass of carbon present in 2g of is 0.52g.

Answer 2

Answer:

In ΔABC

∠A+∠B+∠C=180

∘

(Sum of angles of a triangle)

⇒x+80

∘

+52

∘

=180

∘

⇒x+132

∘

=180

∘

⇒x=180

∘

−132

∘

=48

∘

∠DEC+∠DEA=180

∘

(Linear pair)

143

∘

+z=180

∘

z=180

∘

−143

∘

=37

∘

Now in ΔADE

Ext.∠DEC=∠A+∠ADE

⇒143

∘

=x+y

⇒143

∘

=48

∘

+y

⇒y=143

∘

−48

∘

=95

∘

x=48

∘

,y=95

∘

,z=37

∘