the radii of two cylinder are in the ratio 3:4 and their heights are in the ratio 5:4 .find the ratio of their curved surface area
Answers
Answer:
10 : 9
Step-by-step explanation:
Take an online test Take Now
Login
Studyrankersonline
Ask a Question
If radii of two cylinders are in the ratio 4 : 3 and their heights are in the ratio 5 : 6 find the ratio of their curved surfaces.
0
votes
1.5k views
asked May 31, 2019 in Class VIII Maths by navnit40 (-4,939 points)
If radii of two cylinders are in the ratio 4 : 3 and their heights are in the ratio 5 : 6, find the ratio of their curved surfaces.
surface area volume and capacity (cuboid cube and cylinder)
Please log in or register to answer this question.
1 Answer
0
votes
answered May 31, 2019 by priya12 (-12,626 points)
Ratio in radii of two cylinders = 4 : 3
and ratio in their heights = 5 : 6
Let r1 and r2 be the radii and h1, h2 be their
Heights respectively.
∴ r1 : r2 = 4 : 3 and h1 : h2 = 5 : 6
∴ r1 = 4/3 and h1/h2 = 5/6
∴ Surface area of the first cylinder = 2 πr1h1
and area of second cylinder = 2πr2h2
2 πr1h1/2πr2h2 = (r1/r2 ) × h1/h2 = 4/3 × 5/6 = 20/18
= 10/9 = 10 : 9
∴ Ratio in their surface areas = 10 : 9
_________ Mark as brainlist ____________
Answer:
10:9
Step-by-step explanation:
he radii of two cylinder are in the ratio 3:4 and their heights are in the ratio 5:4 .find the ratio of their curved surface area