Question

Area of annulus $dA = 2\pi r \ dr$, is it a coincidence that $\frac{dA}{dr} = 2\pi r \implies A = \pi r^2$?

score 1.2k · Answer 1 · 2026-05-10 12:35:47

1.2k

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Area of annulus $dA = 2\pi r \ dr$, is it a coincidence that $\frac{dA}{dr} = 2\pi r \implies A = \pi r^2$?

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score 49 · Answer 2 · 2026-04-09 00:14:21

49

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Double integral with multiple conditions

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score 670 · Answer 3 · 2026-05-10 12:53:33

670

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80

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1.1k

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The generous lazy caterer

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score 41 · Answer 6 · 2026-04-15 03:59:15

If $f: \mathbb{R}^2 \rightarrow \mathbb{R}^2$ be defined as $f(x,y) = e^{x+y}, e^{x-y}$, what is the area of the image of $\{0<x,y<1\}$?

score 67 · Answer 7 · 2026-04-11 07:37:41

67

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Fraction of Perimeter

Published on 11 Apr 2026 - 7:37

score 412 · Answer 8 · 2026-04-13 17:25:22

412

Views

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score 1.4k · Answer 9 · 2026-04-16 11:57:33

1.4k

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Published on 16 Apr 2026 - 11:57

score 677 · Answer 10 · 2026-04-29 12:49:46

677

Views

Find the area of curve

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score 211 · Answer 11 · 2026-04-13 16:51:45

211

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score 2.1k · Answer 12 · 2026-05-10 12:55:13

2.1k

Views

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Published on 10 May 2026 - 12:55

score 702 · Answer 13 · 2026-04-29 12:44:06

702

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Published on 29 Apr 2026 - 12:44

score 21.6k · Answer 14 · 2026-05-07 07:35:50

21.6k

Views

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Published on 07 May 2026 - 7:35

score 256 · Answer 15 · 2026-05-10 12:31:16

256

Views

Dividing a hemisphere into two equal surface areas

Published on 10 May 2026 - 12:31

List Question

Area of annulus $dA = 2\pi r \ dr$, is it a coincidence that $\frac{dA}{dr} = 2\pi r \implies A = \pi r^2$?

Double integral with multiple conditions

Parallelogram and similar triangles question

Area related to circles

The generous lazy caterer

If $f: \mathbb{R}^2 \rightarrow \mathbb{R}^2$ be defined as $f(x,y) = e^{x+y}, e^{x-y}$, what is the area of the image of $\{0<x,y<1\}$?

Fraction of Perimeter

Find the maximum area of a triangle given angle and opposite side

Area of a region bounded by $y=8$ and $y= |x^2-1|$

Find the area of curve

Area of Weird Shapes

A line from a vertex of a triangle divides opposite side in a ratio,determine the ratio of areas?

Integrating the area of a circle with rectangles

Is there a formula to calculate the area of a trapezoid knowing the length of all its sides?

Dividing a hemisphere into two equal surface areas

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