Triangles
How can we find the area of a triangle?
area = base x height divided by 2
How can we find the area of a parallelogram?
area = base x height
How can we find the area of a rectangle?
area = base x height
A parallelogram has a base of 2m and a height of 7m.
AREA?
14m2
200 Points
How can we find find the circumference of a circle?
How can we find the area of a circle?
C = π x diameter OR π x radius x 2
A = π x radius x radius
base=9cm height=11cm
AREA?
49.5cm2
base=5cm height=14cm
AREA?
70cm2
base=5cm height=7cm
AREA?
35cm2
Bal is making a triangular banner to take to his friends basketball game. The banner has a height of 55cm and a base of 70cm.
AREA?
A = 1925cm2
Diameter = ?
base=4cm height=6cm
AREA?
12CM2
base=4cm height=12cm
AREA?
48cm2
base=7m height=9m
AREA?
63m2
To make a placemat, Dave uses a rectangle that has a base of 60cm and a height of 80cm.
AREA?
A=4800 cm2
Diameter = 520cm
Radius = ?m
Convert from cm to m
520cm = 5.2m
5.2m ÷ 2 = 2.6m
base=6m area=30m2
HEIGHT?
10m
base=6cm area=54cm2
HEIGHT?
height = 9cm
base=2cm area=68cm2
HEIGHT?
height = 34cm
BONUS:400 POINTS
A water sprinkler is placed at the centre of a circular garden and shoots water a distance of 15 m. It can rotate through an angle of 180°.
What area is the sprinkler able to water?
A = π × r × r
A = 3.14 x 15m x 15m
= 706.86m
360° - 180° = 180° so this is half of the circle so we need to divide by 2
706.85m ÷ 2 = 353.43m2
Circumference = 18.84mm
Diameter = ?
6mm
height=8cm area=144cm2
BASE?
36cm
height=9mm area=81mm2
BASE?
base = 9mm
height=5m area=225m2
BASE?
base = 45m
BONUS 400 POINTS
Bella is designing a triangular flower garden for her back yard. The base of this garden is 5m and the height is 10m. Bella also has enough soil for a garden that has an area of 45m2. What is the area of the flower garden and how much soil will Bella have left over?
A=25m2
Soil leftover = 20m2
Radius = 4cm
Area = ?
50.24cm2