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ICSE Class 10 Answered

Plz answer Q2 c part  Earlier u had told only the formula which I did know but how to use it here was a problem
question image
Asked by lovemaan5500 | 26 Feb, 2018, 09:09: PM
answered-by-expert Expert Answer
begin mathsize 16px style In space triangle space ABC comma space by space Pythagoras space theorem comma
AC squared equals BC squared minus AB squared equals 10 squared minus 8 squared equals 100 minus 64 equals 36 equals 6 space cm
Area space of space triangle ABC equals 1 half cross times AB cross times AC equals 1 half cross times 8 cross times 6 equals 24 space sq. space cm
Let space straight r space be space the space radius space of space the space incircle.
Area space of space triangle space ABC
equals Area space of space triangle OBC plus Area space of space triangle OCA plus Area space of space triangle OAB
rightwards double arrow 24 equals 1 half cross times BC cross times straight r plus 1 half cross times AC cross times straight r plus 1 half cross times AB cross times straight r
rightwards double arrow 24 equals 1 half straight r space left parenthesis BC plus CA plus AB right parenthesis
rightwards double arrow 24 equals 1 half straight r cross times 24
rightwards double arrow straight r equals 2
Area space of space incircle equals πr squared equals 22 over 7 cross times 4 space cm squared
Area space of space shaded space region equals Area space of space triangle ABC minus Area space of space incircle equals 24 minus 22 over 7 cross times 4 equals 80 over 7 space cm squared end style
Answered by Rashmi Khot | 27 Feb, 2018, 10:07: AM
ICSE 10 - Maths
Asked by lovemaan5500 | 26 Feb, 2018, 09:09: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 10 - Maths
Asked by lovemaan5500 | 26 Feb, 2018, 06:56: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
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