In the given figure, the measure of side DC is ___ .
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Solution
In right-angled triangle DBO, OB2=OD2+BD2 ⇒OD2=2O2−122 =400−144=256 ⇒OD=16units. In right angled triangle CAO OA2=OC2+AC2 ⇒OC2=OA2−AC2 ⇒OC2=202−162 ⇒OC2=400−256=144 ⇒OC=12units. Here,DC=OD+OC=16+12=28units.