Question

q no 27.27.29.30 solve it

Answer 1

27.

Area of triangle=

S = (14 + 13 + 15)/2                 (25 - 10 = 15)

S = 42/2 = 21

√s(s-a)(s-b)(s-c)  =  √21(21-14)(21-13)(21-15) = √21 x 7 x 8 x 6 = √7056 = 84

Now we need to find the height

1/2 bh = 1/2  x 15 x h = 84

h = 11.2cm

Area of ║gm = b x h = 10 x 11.2 = 112

Total area = 84 + 112 = 196m²

29.

           1       +        1          +    1           +        1        

      2 + √5          √5 - √5      √8 - 3          √7 + √5

=       2 - √5    +  √5  + √5   +  √8 + 3    +    √7 - √5  

        4 - 5               0                    8 - 9             7 - 5

=   -2 - √5 + 0 - √8 - 3  + (√7 - √5)

                                              2

=   - 4 - 2√5 - 4√2 - 6 + √7 - √5

= -10 - 3√5  - 4√2 + √7

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