8A Core skills 1. Find the measure of the angle labelled A in each of the following. Justify your answer in each case.
(i) (ii) A A A A 122° A 122° (iv) AA122° 122° 122°
114° (v)
114° 24° 40° A 35°
114° 114° 35°
35° 114° A 35° 35° 35° 35° A 122° 75° 75° 75° 75°
114° A
A AA J J J JJ 75° M M (vi) A M M A AA 75° 35° 35° 35° 35° 35° M M115° A L
115°115° J30°115°
115° A L 115° 30° K 30°30°
2. Find the value of x, y and z in each of the following. Justify your answers in each case. (i)
(ii) x° 138° 138° x° x° (iv) 65° x° y°
z° x° y° x° y°
x° 73° 65° 65° (v) z° z° 141° y° x° 125° z°
80° 65° 95°
x° y° y z° ° x°
73° y° 73° 73°
y z° ° z° y z° ° x° x° z° (vi)
80° 65° 95°
z° x°
80° 65° 95°
x° y° y° z° z° 61° x° 138° 138° 153° 153° 153° y° x° x° z° 61° z° y° 61° y° (iii) 30° K K K K
A L A L A L
A L 30°
K 35° A A A A AA A (iii)
3. Copy the diagram shown. On your diagram: (i) use the letter A to mark a pair of corresponding angles (ii) use the letter B to mark a pair of vertically opposite angles (iii) use the letter C to mark a pair of alternate angles
(iv) use the letter D to mark any other pair of angles that are related to each other and describe the relationship between them.