1. GCSE Mathematics
Targeting Grade C
SSM 3

2. Can you: If not you need Calculate the area of a rectangle
Calculate the area of a triangle
Calculate the area of a composite
shape
Calculate the area of a trapezium
Calculate the area of a cross-section of a prism
Calculate surface area of a prism
Try a test
Practice 1: Remember the formula L x W
Practice 2: Remember the formula ½ x b x h
TAIL 1
Practice 3: Remember the formula ½ x (a + b) x h
Practice 4: To calculate the area of a composite shape, divide the shapes into rectangles and/or triangles, find the area of each shape separately and add together
Practice 5: Remember the cross-section is the face which stays the same wherever you cut the prism
TAIL 2
If not you need

3. Practice 1: Find the area of the following rectangles 1.
Remember the formula for area of a rectangle is length x width
Practice 1: Find the area of the following rectangles 1.
2. A field is in the shape of a rectangle. It measures 94 metres by 221 metres.
What is its area in square metres?
3. The driveway to a house has to be re-surfaced. The cost is ￡56 per square metre.
What is the cost for a drive measuring 16 metres by 5 metres?
Lesson

4. Practice 2: Find the area of the following triangles:
Remember the formula for finding the area of a triangle is ½ x base x height
Lesson

5. Practice 3: Find the area of the following trapezium:
Remember the formula for finding the area of a trapezium is ½ x (a + b) x h
Lesson

6. Practice 4: Find the area of the following composite shapes
Divide the shapes into rectangles and/or triangles and find the areas of each shape separately then add the areas together
Lesson

7. Are you ready for the answers?
TAIL 1
Are you ready for the answers?
7.1 x 3.6 = 25.56
To 1 decimal place = 25.6
Area of rectangle is length x width
Area = 2x × x = 2x²
2x² = 50
x² = 25
X = 5
Length is 2x so
length = 2 × 5 = 10
Lesson

8. Practice 5: Find the area of the cross-section of the following shapes
Remember a cross-section of a prism is the shape which stays the same if the shape is sliced through
Lesson

9. Are you ready for the answers?
TAIL 2
17 x x x 8
= 402cm²
3 x x 4
= 39cm²
10 x 5 –(0.5 x (10 + 5) x 4)
50 – 30
= 20cm²
5.6 x
7.2 – 2.5 = 4.7
4.7 x 1.8 =8.46
= 22.46cm²
Lesson