Hard Math Class 9 Level 2

The curved surface area of a cylinder is 440 cm² and radius is 7 cm. What is its height?

बेलन का वक्र पृष्ठीय क्षेत्रफल 440 cm² और त्रिज्या 7 cm है। ऊंचाई कितनी होगी?

Show answer and explanation

Correct Answer

C. 10 cm / 10 cm

Explanation

Using 2πrh = 440 with r = 7 gives 44h = 440 so h = 10 cm.

2πrh = 440 में r = 7 रखने पर 44h = 440 इसलिए h = 10 cm।

Related Questions

Easy Math Class 10 Level 1

What is the HCF of 24 and 36?

24 और 36 का महत्तम समापवर्तक क्या है?

Answer and explanation locked 🔒

Tap once to confirm. On the next tap, login will open for the answer.

Easy Math Class 10 Level 1

What is the mean of the numbers 2 4 6 and 8?

संख्याओं 2 4 6 और 8 का माध्य क्या है?

Answer and explanation locked 🔒

Tap once to confirm. On the next tap, login will open for the answer.

Easy Math Class 10 Level 1

What is the area of a circle with radius 7 cm when π = 22/7?

7 सेमी त्रिज्या वाले वृत्त का क्षेत्रफल कितना होगा जब π = 22/7 हो?

Answer and explanation locked 🔒

Tap once to confirm. On the next tap, login will open for the answer.

Easy Math Class 10 Level 1

What is the probability of getting an even number when a die is thrown once?

एक पासे को एक बार फेंकने पर सम संख्या आने की प्रायिकता क्या है?

Answer and explanation locked 🔒

Tap once to confirm. On the next tap, login will open for the answer.

Easy Math Class 10 Level 1

What is the value of sin 30°?

sin 30° का मान क्या होता है?

Answer and explanation locked 🔒

Tap once to confirm. On the next tap, login will open for the answer.

Easy Math Class 10 Level 1

What is the distance between the points (0,0) and (3,4)?

बिंदु (0,0) और (3,4) के बीच की दूरी कितनी है?

Answer and explanation locked 🔒

Tap once to confirm. On the next tap, login will open for the answer.