Question

Find the value of y, if *

The area of triangle with sides 11cm, 9cm and 12cm is of the form y 35cm?
0 (a) y
(a) y = 64
0 (b) y = 8
0 (c) y = 2
0 (d) y = 4​

Answer 1

Answer:

(a) y = 64

Sides of triangle are 11,12,13

Area of triangle =  

s(s−a)(s−b)(s−c)

​  

 

s=  

2

a+b+c

​  

 

s=  

2

11+12+13

​  

 

s=18

Area of triangle =  

18(7)(6)(5)

​  

 

Area of triangle =  

18(7)(6)(5)

​  

=61.5

Area of triangle =  

2

1

​  

(base)(altitude)

61.5 =  

2

1

​  

×12×(altitude)

Altitude = 10.25

Step-by-step explanation:

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