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Answer

(5)
18 x 8 = 144
8/2 = 4
18/2 = 9
(1/2) x 4 x 9 = 18
144 – 18 = 126

Ans : 126 sq cm.

 

(6)
Drawing a line from point S to point T to obtain 2 triangles, PST and STV,
the shaded area = (1/2) x (10 + 5) x 12 + (1/2) x 3 x 5 = 97.5

Ans : 97.5 sq cm

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Q6

This is a Part Whole question .

  Triangle  1  Triangle 2 shaded total     
  60 22.5   180    
             

1/2 × 12 × 10 = 60

1/2 × 5 × 9 =22.5

15 × 12 = 180

180 – 60 – 22.5 = 97.5 cm^2

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Q5

This is a Part whole question.

   Shaded  unshaded total          
    18 126          
                 

1/2 × 4 × 9 = 18

18 × 8 = 126

126 – 18 = 108

 

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