NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes Ex 5.9

Class 6 Maths Chapter 5 Understanding Elementary Shapes Ex 5.9 Class 6 Maths Chapter 5 Exercise 5.9 Ncert Solutions For Class 6 Maths Chapter 5 Exercise 5.9

NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes Ex 5.9

Question 1.
Match the following :
(a) Cone

(b) Sphere

(c) Cylinder

(d) Cuboid

(e) Pyramid

Give two new examples of each shape.
Solution :
(a) ↔ (ii)
(b) ↔ (iv)
(c) ↔ (v)
(d) ↔ (iii)
(e) ↔ (i).
(i) Birthday cap, ice-cream cone
(ii) Tennis Ball, laddu
(iii) Road-roller, gas cylinder
(iv) Brick, book
(v) Pyramids of Egypt, right pyramid.

Question 2.
What shape is
(a) Your installments box?
(b) A brick?
(c) A matchbox?
(d) A road-roller?
(e) A sweet laddu?
Solution :
(a) Cuboid
(b) Cuboid
(c) Cuboid
(d) Cylinder
(e) Sphere.

Question 1

Find the missing angle of a triangle:

Angles: 50°, 60°, and x

Solution

Sum of triangle angles:

50∘+60∘+x=180∘50^\circ + 60^\circ + x = 180^\circ50∘+60∘+x=180∘

Add known angles:

110∘+x=180∘110^\circ + x = 180^\circ110∘+x=180∘

Solve:

x=70∘x = 70^\circx=70∘

Answer:

70∘70^\circ70∘

Question 2

Find missing angle in a triangle:

Angles: 90°, 35°, x

Solution

90∘+35∘+x=180∘90^\circ + 35^\circ + x = 180^\circ90∘+35∘+x=180∘

125∘+x=180∘125^\circ + x = 180^\circ125∘+x=180∘

x=55∘x = 55^\circx=55∘

Answer:

55∘55^\circ55∘

Question 3

Find missing angle of quadrilateral:

Angles: 90°, 80°, 100°, x

Solution

Sum of quadrilateral angles:

90∘+80∘+100∘+x=360∘90^\circ + 80^\circ + 100^\circ + x = 360^\circ90∘+80∘+100∘+x=360∘

Add known angles:

270∘+x=360∘270^\circ + x = 360^\circ270∘+x=360∘

Solve:

x=90∘x = 90^\circx=90∘

Answer:

90∘90^\circ90∘

Question 4

Find missing angle:

Quadrilateral angles: 110°, 70°, 95°, x

Solution

110∘+70∘+95∘+x=360∘110^\circ + 70^\circ + 95^\circ + x = 360^\circ110∘+70∘+95∘+x=360∘

275∘+x=360∘275^\circ + x = 360^\circ275∘+x=360∘

x=85∘x = 85^\circx=85∘

Answer:

85∘85^\circ85∘