1.

In the figure, line l || line m and line p || line q. Find the measures of ∠a, ∠b, ∠c and ∠d.

Answer»

i. line l|| line m and line p is a transversal. 

∴ m∠a = 78° …(i) [Corresponding angles] 

ii. line p || line q and line m is a transversal. 

∴ m∠d = m∠a …[Corresponding angles] 

∴ m∠d = 78° …(ii) [From (i)] 

iii. m∠b = m∠d …[Vertically opposite angles] 

∴ m∠b = 78° …[From (ii)] 

iv. line l|| line m and line q is a transversal. 

∴ m∠c + m∠d = 180° …[Interior angles] 

∴ m∠c + 78° = 180° … [From (ii)]

∴ m∠c =180° – 78° 

∴ m∠c = 102° 

∴ m∠a = 78°, m∠b = 78°, m∠c = 102°, m∠d = 78°



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