11. The length of a side of a rhombus is 4.1 cm and one of its diagonals is 1.8 cm.
Find the area of the rhombus.
(2018) 1
(1) 10.8 sq cm (2) 3.6 sq cm (3) 7.2 sq cm (4) 8.1 sq cm
Find the area of the rhombus.
(2018) 1
(1) 10.8 sq cm (2) 3.6 sq cm (3) 7.2 sq cm (4) 8.1 sq cm
Answers & Comments
Answer:
the correct answer is (3) 7.3 sq cm
Step-by-step explanation:
area of triangle=
s=(4.1+4.1+1.8)/2 =10/2, =5cm
\sqrt{5(5 - 4.1)(5 - 4.1)(5 - 1.8)}
5(5−4.1)(5−4.1)(5−1.8)
=
\sqrt{5 \times .9 \times .9 \times 3.2}
5×.9×.9×3.2
=4×0.9 , =3.6 cm^2
area of rhombus=2×3.6, =7.2 cm^2