Geometry 1a
Extra questions for before the assessment
Try these questions.
(You’ll find the answers on the last two pages)
Key Skill 1: Describe various types of angles
Acute
Obtuse
Reflex
Right
Straight
Use the above terms to describe each of the following angles:
(a)
(b)
(c)
(d)
Key Skill 2: Naming angles
Name the following angles:
W
T
O
P
A
S
Key Skill 3: Accurately draw triangles and basic quadrilaterals
Key Skill 4: Use several methods to accurately draw triangles
Accurately draw the following:
60°
45°
70°
5 cm
40°
6 cm
5.2 cm
4 cm
4.5 cm
5 cm
8 cm
4.5 cm
Key Skill 5: Calculate the unknown angles within any triangle
(a)
Calculate the missing angle of a triangle with angles 45° and 60°
(b)
Calculate the missing angle of a triangle with angles 128° and 18°
(c)
Calculate the missing angles in the triangles below:
(i)
(ii)
43°
59°
70°
40°
Key Skill 6: Calculate the unknown angles within any quadrilateral
(a)
Calculate the missing angle of a quadrilateral with angles 145°, 74° and 60°
(b)
Calculate the missing angle of a quadrilateral with angles 128°, 76° and 18°
(c)
Calculate the missing angles in the quadrilaterals below:
(i)
(ii)
64°
147°
Key Skill 7: Find the perimeter of triangles and quadrilaterals in mm and cm
(a)
Find the perimeter of a triangle with sides 17 cm, 23 cm and 35 cm
(b)
Find the perimeter of a quadrilateral with sides 16 mm, 25 mm, 19 mm and 21 mm
(c)
Calculate the perimeter of the shape below
45 mm
18 cm
162 mm
Answers
Key Skill 1
a)
Acute
b)
Right
c)
Reflex
d)
Obtuse
Key Skill 2
a)
TOP,
POT
b)
WAS,
SAW
Key Skill 3 and 4
60°
45°
70°
5 cm
40°
6 cm
5.2 cm
4 cm
4.5 cm
5 cm
8 cm
4.5 cm
Key Skill 5
(a)
45° + 60° = 105°
;
180° - 105° = 75°
(b)
128° + 18° = 146°
;
180° - 146° = 34°
(c)
(i)
43° + 59° = 102°
;
180° - 102° = 78°
(ii)
70° + 40 = 110°
;
180° - 110° = 70°
Key Skill 6
(a)
145° + 74°+ 60° = 279°
;
360° - 279° = 81°
(b)
128° + 76° + 18° = 222°
;
360° - 222° = 138°
(c)
(i)
(ii)
64°
147°
64°
147°
64° + 64° = 128°
147° + 147° = 294°
360° - 128° = 232°
360° - 294° = 66°
232°  2 = 116°
66°  2 = 33°
116°
64°
147°
33°
33°
147°
64°
116°
Key Skill 7
(a)
17 + 23 + 35 = 75 cm
(c)
180 mm + 45 mm + 162 mm = 387 mm
(b)
16 + 25 + 19 + 21 = 81 mm