Question

A park is in the shape of a quadrilateral ABCD in which AB = 9 m, BC = 12 m, CD = 5 m and AD = 8 m. If Angle C =90degree , find the area of the park​

Answer 1

Step-by-step explanation:

area of the triangle ABC

=1/2 base ×height

=1/2×12×15cm2

=90cm2

semiperimeter of the triangle 12+9+15/2

=36/2cm=18 cm

now by heron's formula

Area of the ∆ACD= √18(18-12)(18-9)(18-15) (unriot all)

√18×6×9×3

=√3×6×6×3×3×3

3×3×6

=54

so the area of park =90+54cm2

= 144cm2

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Answer 2

Answer:

The principle of reversibility presupposes that the attenuation of a light ray during its passage through an optical medium because of reflection, refraction, and absorption is not affected by a reversal of the direction of the ray.