Question

the sides of triangle are 12cm,18cm and find 20cm find its area​

Answer 1

Answer: area of triangle= 1/2 b×h

=1/2×12×18

=108cm square

Answer 2

Answer:

135 cm²

Step-by-step explanation:

let 18cm be the length of the base and 12 cm be the side left of the base.

•°• By pythagoras theorem

(12cm)²+ (18/2 cm)² =( length of the altitude )²

144cm² + (9cm)² = (length of the altitude)²

144cm² + 81 cm² = (altitude )²

225cm² = (altitude)²

sq.rt (225 cm²) = altitude

altitude = 15 cm

area of a triangle = ½×base×height

•°• area of the triangle = (½×18×15)cm²

•°• area = 135 cm²

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