refreshment of math. grade 9

What is sine?

• opposite/hypotenuse

• opposite/adjacent

• adjacent/hypotenuse

• adjacent/opposite

sin x = 0.5. What is x?

• 30

• 45

• 60

• 90

The height of the building is 10 m. He uses a stair to get top of building. the angle between stair and ground is 60 degree. Find the length of stair needed.

• 11.55 m

• 18.66 m

• 16 m

• 8.66 m

Slant height of cone is 13 m. The diameter of the base is 10 m, find height of cone.

• 5 m

• 8.3 m

• 12 m

• 6m

The volume of cube is 27m3. Te surface area of cube is ....

• 9 m2

• 18 m2

• 36 m2

• 54 m2

A cone has a circular base of radius 12 m and a height of 30 cm. Find the volume of the cone

• 1300 x 22/7

• 2600 x 22/7

• 4520 x 22/7

• 11040 x 22/7

Which one of the following is a shape of prism?

• paper

• pyramid

• cone

• coca cola can

What is kind of triangle that has side of 6m, 8 m and 12 m?

• acute angled triangle

• obtuse angled triangle

• right angled triangle

• none of them

2 sin 30 x 2 + cos 60 = .....

• 0.5

• 1

• 1.5

• 2.5

What is formula of this figure for volume?

• 1/2 x 22/7 x r x r x h

• 22/7 x r x r x h

• 1/3 x 22/7 x r x r x d

• 1/3 x 22/7 x r x r x h