Questions and Answers
A rectangular prism has a length of 8 cm, a width of 5 cm, and a height of 3 cm. Find the total surface area of the prism.
148 cm^2
A cylinder has a radius of 4 cm and a height of 10 cm. Find the volume of the cylinder.
502.65 cm^3
A cone has a radius of 6 cm and a height of 12 cm. Find the slant height of the cone.
13.42 cm
In a right-angled triangle, the length of the hypotenuse is 10 cm and one of the other sides is 6 cm. Find the length of the third side.
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A water tank is in the shape of a rectangular prism with a length of 5 m, a width of 3 m, and a height of 2 m. If the tank is filled to a height of 1.5 m, find the volume of water in the tank.
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A rectangular prism has a length of 12 cm, a width of 7 cm, and a height of 4 cm. Find the surface area of the front face of the prism.
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A cylinder has a radius of 3 cm and a height of 8 cm. Find the total surface area of the cylinder, including the bases.
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In a right-angled triangle, the length of the hypotenuse is 15 cm and one of the other sides is 9 cm. Find the sine of the angle opposite the 9 cm side.
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A water tank is in the shape of a cylinder with a radius of 2 m and a height of 3 m. If the tank is filled to a height of 2.5 m, find the volume of water in the tank.
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A cone has a radius of 5 cm and a height of 10 cm. Find the cosine of the angle between the slant height and the base.
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Study Notes
Surface Area of 3D Shapes
- The surface area of a 3D shape is the total area of its surface
- Formulas for surface area:
- Cube: 6s^2 (where s is the side length)
- Rectangular Prism: 2lh + 2lw + 2lh (where l, w, and h are the length, width, and height)
- Cylinder: 2πr(h + r) (where r is the radius and h is the height)
- Sphere: 4πr^2 (where r is the radius)
Volume of 3D Shapes
- The volume of a 3D shape is the amount of space inside it
- Formulas for volume:
- Cube: s^3 (where s is the side length)
- Rectangular Prism: lwh (where l, w, and h are the length, width, and height)
- Cylinder: πr^2h (where r is the radius and h is the height)
- Sphere: (4/3)πr^3 (where r is the radius)
Capacity of 3D Shapes
- Capacity is the amount of liquid a 3D shape can hold
- Measured in units such as milliliters (mL) or liters (L)
Trigonometry
- Trigonometry involves the study of triangles and their relationships
- Key concepts:
- Angles: measured in degrees
- Sine (sin): opposite side / hypotenuse
- Cosine (cos): adjacent side / hypotenuse
- Tangent (tan): opposite side / adjacent side
- Right-angled triangles: used to solve problems involving trigonometry
Surface Area of 3D Shapes
- Surface area is the total area of all surfaces of a 3D shape
- Formula for surface area of a rectangular prism: 2(lw + lh + wh)
- Formula for surface area of a cylinder: 2πr(h + r)
- Formula for surface area of a sphere: 4πr²
Volume of 3D Shapes
- Volume is the amount of space inside a 3D shape
- Formula for volume of a rectangular prism: lwh
- Formula for volume of a cylinder: πr²h
- Formula for volume of a sphere: (4/3)πr³
Capacity of 3D Shapes
- Capacity is the amount of fluid that can be held by a 3D shape
- Measured in units such as milliliters (mL) or liters (L)
Trigonometry - Bearings
- Bearing is the direction or angle of a point from a reference point
- Measured in degrees, using a protractor or a compass
- 3-figure bearings: e.g. 045°, 135°, 225°, 315°
Trigonometry - Sine, Cosine, and Tangent
- Sine (sin): opposite side / hypotenuse
- Cosine (cos): adjacent side / hypotenuse
- Tangent (tan): opposite side / adjacent side
- SOH-CAH-TOA: a mnemonic to remember the trig ratios
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