1. EVERYTHING YOU NEED TO KNOW TO GET A GRADE C
GEOMETRY & MEASURES
(FOUNDATION)
AUTHOR

2. 2.5 -1

3. Alternate angles are equal
70°
40°
70°
Alternate angles are equal
Angles on a straight line add up 180°
180° - 110°
= 70°
Angles in a triangle add up 180°
180° - 40° - 70°
= 70°
As both base angles are 70°, triangle BEF is isosceles.

4. Alternate angles are equal
55°
55°
Alternate angles are equal
Angles in a triangle add up 180°
180° - 70° - 55°
= 55°
As both base angles are 55°,
triangle ABC is isosceles.

5. 41°
113° 41
Interior angles add up to 180°
180° - 67°
= 113°
113

6. OTHER ANSWERS ALSO ALLOWED Perimeter is the length around a shape2
4cm
3cm
3cm
OTHER ANSWERS ALSO ALLOWED
4cm
6cm
2cm
2cm
6cm
Perimeter of rectangle A =
14cm
Perimeter is the length around a shape
Perimeter of rectangle B =
16cm
Difference =
16cm - 14cm 2

7. Perimeter is the length around a shape
6cm
4cm
4cm
Perimeter is the length around a shape
6cm
Perimeter of rectangle =
6cm + 4cm + 6cm + 4cm 20
Square has 4 equal sides
3cm for each side

8. OTHER ANSWERS ALSO ALLOWEDx x x x
Because two lengths of 12cm makes 24cm which is more than the perimeter
As evident from the rectangle drawn for part (a)

9. Find the only rectangle which has a perimeter of 26cm
40cm
1cm
20cm
2cm
10cm
4cm
8cm
5cm
Find the only rectangle which has a perimeter of 26cm 8 5

10. Split compound shape into two rectangles
Kilo means a thousand
1km = 1000m
1000m
Area =
Length x Width
= 1000m x 10m
Split compound shape into two rectangles
Rectangle A
200m
Rectangle B
Area of rectangle A =
100 x 30
Area of rectangle B =
200 x a
200a = 10000 35
200a = 7000

11. Count the number of squares to find the areaC B E

12. Shaded Area = Area of square – Area of circle
30cm
Diameter
LEARN THE FORMULAE OFF BY HEART
Area of square =
length x width
= 80cm x 80cm
Area of circle =
= 3.14 x 30cm x 30cm
Area shaded =
3574

13. equal to less than (because the length around the shape is the same)
(because more than half the rectangle is unshaded)

14. 10cm
10cm
Shaded Area = Area of big square ABCD – Area of the 4 congruent (identical) triangles
Area of big square =
length x width
= 10cm x 10cm
Area of one triangle =
Area of one triangle =
Area of one triangle =
Shaded area =
Area of four triangles = 82

15. 900 50 60 Area of small square = 30cm x 30cm Length of large square = 50
Area of floor =
300cm x 180cm
Number of small tiles needed =
Number of small tiles needed = 60

16. 8 A and C C and D Perimeter is the length around a shape
Perimeter B = 9cm
Perimeter A = 10cm
Perimeter is the length around a shape
2cm
2cm
2cm
2cm
Perimeter C = 10cm
Perimeter of D =
2cm + 2cm + 2cm + 2cm 8
A and C
Area is the space inside a shape
C and D

17. Shaded Area = Area of big square – Area of two smaller squares
length x width
= 12cm x 12cm
Area of one small square =
length x width
= 4cm x 4cm
Area of both squares =
Shaded Area =
Area of big square =
length x width
Area of one small square =
length x width
Area of both squares =
Shaded Area =
Fraction shaded =
Unshaded

18. 6

19. A, B and E