Question

find the perimeter of the rectangle whose length is 40 cm and a diagonal is 41 CM​

Answer 1

Answer:

perimeter of the rectangle is 98 cm

Answer 2

Answer:

Step-by-step explanation:

In the figure AB = Length = 40 cm

AC is the diagonal = 41 cm

Δ ABC is a right angled triangle

Hyp² = B² + Alt²

Alt² = Hyp² - B²

BC² = AC² - AB²

BC² = (41)² - (40)²

BC² = 1681 - 1600

BC² = 81

BC = √81 = 9 m

Length = 40 cm

Breadth = 9 cm

Perimeter = 2(l+b)

= 2(40+9)

= 2 × 49

= 98 m