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Visualising Solid Objects by Viewing the Cross Section

Question 17 I...

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Question 17
If we rotate a right-angled triangle of height 5 cm and base 3 cm about its height a full turn, we get

a) Cone of height 5 cm, base 3 cm

b) Triangle of height 5 cm, base 3 cm

c) Cone of height 5 cm, base 6 cm

d) Triangle of height 5 cm, base 6 cm

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Solution

If we rotate a right-angled triangle of height 5 cm and base 3 cm about its height a full turn, then we get a cone of height 5 cm and base radius 3 cm.

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Question 18
If we rotate a right-angled triangle of height 5 cm and base 3 cm about its base, we get
a) Cone of height 3 cm and base 3 cm
b) Cone of height 5 cm and base 5 cm
c) Cone of height 5 cm and base 3 cm
d) Cone of height 3 cm and base 5 cm

The base and height of the triangle are in the ratio 3:2. If the area of the triangle is 243 cm $^{2}$ , find the base and height of the triangle.

Q. Write the area of a triangle having

5 c m

base and height

6 c m

.

The base of a prism is in the form of a right angled triangle. The triangle has base and height equal to 5 cm and 8 cm respectively. If the height of prism is 12 cm, the volume of prism will be :

Find the area of a right-angled triangle whose base is 3 cm and height is 4 cm.

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Visualising Solid Objects by Viewing the Cross Section

Standard VII Mathematics

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