ABC is a right angled triangle, right angled at B and ∠A

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ABC is a right angled triangle, right angled at B and ∠A = 60° and AB = 20 cm, then the ratio of sides BC and CA is

∠B = 90°
∠A = 60°
∠C = 180° – 90° – 60° = 30°

cosC =	BC
	CA

⇒cos30° =	BC
	CA

⇒		√3	=	BC	= √3 : 2
		2		CA