Question

Find the area if triangle whose sides are 4.5 cm and 10cm and perimeter 15.5 cm
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Answer 1

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 ➺P= 15.5

15.5 = 4.5+10+x

X= 15.5–14.5 cm

X= 1 cm

S= Perimeter/ 2 = 0.5 or 1/2

Area by Heron's formula -

A= √(S(S−a)(S−b)(S−c))

​⇒ √(0.5(0.5−4.5)(0.5−10)(0.5−6))

​⇒ √(0.5(–3)(–9.5)(–5.5))

​⇒ √(–78.375)

⇒A= 8.85 cm²

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Answer 2

Step-by-step explanation:

1st side = 4.5cm

2nd side =10cm

3rd side =?

Perimeter =15.5

3rd side =P-(1st side +2nd side)

=15.5-(4.5+10)

=15.5- 14.5

=1cm