36.
A poor artist on the street makes funny
cartoons for children and earns his living.
Once he made a comic face by drawing a
circle within a circle, the radius of the bigger
circle opening 30 cm and that of smaller
being 15 cm as shown in the figure. What
the area of the cap given in the figure? The
base of the cap being the diameter of the
bigger circle?
(4)
Cap
Answers
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Step-by-step explanation:
sorry I can't understand say clearly
Answered by
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Answer:
Radius of bigger triangle is with centre O=30 cm
Radius from O'=20cm
difference of their radii =distance between their centres O andO' =10cm
AB is a tangent if smaller circle so,/_OCA=90°=/_OCB
In triangle ica
AO²=AC²+CO²
30²=AC²+10²
900=AC²+100
AC=20√2
AC=CB
AB=AC+CB
AB=AC+CB
AB=2AC
AB=2*20√2
AB=40√2cm
CD=30-10
=20cm
Area of cap=AR of adb
1/2×AB×CD
1/2×40√2×20=400√2cm²
400×1.414
=565.6cmRadius of bigger triangle is with centre O=30 cm
Step-by-step explantion
mark me brain list plese
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