Question

1) Find the values of.
sin30 + tan45

2)Radius of a sphere us 10 cm.then it's total surface area = _________sq.cm.

3) If the side of a cube is 0.7m then it's volume = ______​

Answer 1

Answer:

1. sin 30 = 1/2

tan 45 = 1

sin30 + tan45 = 1/2 + 1

= 3/2

2. surface area of a sphere= 4πr^2

r = 10 cm

surface area = 4 x 3.14 x 10 x 10

= 1256 cm^2

3. volume of a cube= (side)^3

side= 0.7m

volume= (0.7)^3

= 0.343m^3

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Answer 2

1) sin30° + tan45°

$= \frac{1}{2} + 1 \\ = \frac{1 + 2}{2} \\ = \frac{3}{2}$

2) Radius of sphere=10cm

TSA of Sphere = 4πr²

$= 4 \times \frac{22}{7} \times 10 \times 10 \\ \\ = \frac{8800}{7} \\ = 1257.1cm ^{3}$

3) Volume of cube = a³

= 0.7×0.7×0.7

$= \frac{7}{10} \times \frac{7}{10} \times \frac{7}{10} \\ \\ = \frac{343}{1000} \\ \\ = 0.343cm ^{3}$