Question

The area of triangle with given two sides and respectively and perimeter equal to is​

Answer 1

Answer:

Step-by-step explanation:

Perimeter of traingle is 42 cm.

(ii) Measure of two sides of traingle are 18 and 10 cm respectively.

To Find:

(i) What is the area of triangle?

Solution: Let the third side of triangle be x cm. Therefore,

=Sum of all sides= Perimeter

= 18+10+x= 42

= x= 42-28

x= 14 cm { Third side of triangle}

Answer 2

Answer:

Two sides length are given, we need to figure out the length of this side.

⇒Let x be length of third side

⇒Perimeter =42 cm

⇒18+10cm+x=42

⇒x=42−28=14 cm

⇒2s=42

⇒s=21 cm

⇒a=18,b=10,c=14

⇒A= √s(s−a)(s−b)(s−c)

√21(21−18)(21−10)(21−14)

√21×3×11×7

⇒A=21 √11 cm²