Question

plz answer urgently
i need it quickly....plz answer

Answer 1

Answer:

96

Step-by-step explanation:

A=s(s﹣a)(s﹣b)(s﹣c)

s=a+b+c

2

Solving forA

A=1

4﹣a4+2(ab)2+2(ac)2﹣b4+2(bc)2﹣c4=1

4·﹣204+2·(20·16)2+2·(20·12)2﹣164+2·(16·12)2﹣124=96

Answer 2

Answer:

Answer is option A

Step-by-step explanation:

Method (1)

You can use heron's formula

A = (s(s - a)(s - b)(s - c)) ^1/2

Here,

s = (a + b + c) / 2

s = (20 + 16 + 12) / 2

s = 24

A = (24(4)(8)(12)) ^1/2

A = 9216 ^1/2

A = 96 sq cm.

Method (2)

It is to be observed that (20,16,12) is a pythagorean triplet,

so it is a right angle triangle with hypotenuse 20.

A = 1/2 × b × h

A = 1/2 × 16 × 12

A = 96 sq cm.