If a parallelogram is not a rectangle, how many right angles does it have?
2. Which one of the following statements is false? (a) A parallelogram can also be a rhombus. (b) A parallelogram can also be a rectangle. (c) A parallelogram can also be a square. (d) A parallelogram can also be a triangle.
3. ABCD is a parallelogram with two adjacent (beside each other) angles A and B equal to each other. Which of the following terms could be used to represent ABCD ?
(a) Rhombus (b) Triangle (c) Rectangle (d) None of these
4. For each of the following diagrams, write down if they represent a real parallelogram. Justify your answer in each case.
(i) 60° (iii) 69° 113° (v) 120° 120° 111° 67° 14 cm (vi) 40cm 400 mm 14 cm 50 cm
5. For the parallelograms below, fi nd the measure of the angles marked A and B. Justify your answer by stating the axiom, theorem, or corollary used.
(i) A 120° B 122° 58°
6. Each square in the diagram shown has an area of 1 c m 2
. How many ways can you fi nd the area of the
parallelogram in red without using a ruler or protractor? (Diagram not to scale)
7. Find the value of x and the value of y in the following diagrams. (i)
126° 2x 54° 3y 7y + 23
8. The diagram on the right shows the treads of a tire that is made up of parallelogram shapes. Find the measure of the angles labelled A to D .
9. A parallelogram has side lengths in the ratio 3 : 4 and perimeter 280 cm. Determine the lengths of the sides.
C A
D B 62° 108° 378 Linking Thinking 1 (ii) 4x + 7 A 60° (ii) A B B 78° B (iii) A 102° (iv) 117° 63° 0.5 m 60° (ii) 60° (iv) 122° 120° 58°