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The radius of the circle is known to be equal to the side length of the square, and the area of the square is 20cm2 It's 20 square centimeters
If the area of a square is 20 square centimeters, then its side length is 20 centimeters below the root sign. Then using the area formula of the circle, we can find that the area of the circle is 3.14 times 20 (62.8) square centimeters
Given that the side length of a square is equal to the diameter of a circle, then the area of a square is greater than that of a circle______ (judge right or wrong)
If the side length of a square is 4 cm, then the radius of the circle is 2 cm,
The area of the square is 4 × 4 = 16 (square centimeter),
The area of the circle is 3.14 × 22 = 12.56 (square centimeter),
So the area of a square is larger than that of a circle
So the answer is: right
Given that the side length of two squares in the figure is 2cm and 4cm respectively, calculate the area of shadow part
4×2÷2+（3.14×22×1
4-2×2÷2），
=4+（3.14-2），
=4+1.14，
=14 (square centimeter);
A: the area of the shadow part is 5.14 square centimeters
As shown in the figure, it is composed of two squares. The side length of the small square is a. calculate the shadow area
The square abgf is a square, the quadrilateral gcde is a square
As shown in the figure, the size of two squares, the side length of the small square is 10cm, calculate the shadow area
If your graph is two squares of size, the shadow part is a triangle, and the three vertices of the triangle are the vertices of the square
Then the shadow area = 10 × 10 △ 2 = 50 (square centimeter)
As shown in the figure, put the squares with side length a and B side by side, and calculate the area of shadow part in the figure
One
2（a+b）a+1
2b2-1
2（a+b）a=1
2b2．
A: the area of the shadow in the figure is 1
2b2．
A graph is composed of two squares with sides of 5cm and 4cm
（4+5）×5÷2-（5×5-1
4×3.14×52），
=9×5÷2-（25-0.785×25），
=22.5-（25-19.625），
=22.5-5.375，
=17.125 (square centimeter);
A: the shadow area is 17.125 square centimeters
The perimeter and area of a circle inscribed triangle and a circle inscribed square with radius R are calculated respectively Inscribed regular triangle
As shown in the figure
The radius is r
Then the side length of the square inscribed in the circle is root 2 * r
The circumference of the inscribed square is 4 * root 2 * r and the area is 2R & sup2;
The radius is r
Then the side length of an inscribed regular triangle is the root 3 * r
The circumference of a regular triangle is 3 * root 3 * r and area is 1 / 2 * root 3 * r * 3R / 2 = 3 * root 3 / 4 * r & sup2;
The length, center, distance, area, perimeter and center angle of a circle with radius R are calculated
The edge length of the inscribed regular triangle with radius r = R (√ 3) / 2 = 0866r perimeter = 2598r area = R / 4 × 0866r × 3 = 06495r? The distance between the edge centers = R / 4 the corresponding center angle of the edge = 120 ° the edge length of the inscribed square with radius r = R √ 2 / 2 = 07071r perimeter = 2828284r area = R / 2 × r = 0,5r? Edge center
Square perimeter area volume. Rectangle area perimeter volume. Circular area perimeter. Trapezoid perimeter area. Triangle area perimeter. Cylinder cone volume Use letters and write separately And the surface area
Square perimeter: 4A square area: a * a cube volume: a * a * a rectangle area: a * B rectangle perimeter: 2 * (a + b) cuboid volume: a * b * h circle perimeter: Wu D circular area: Wu R * r trapezoid perimeter: a + B + C + D trapezoidal area: (a + b) * H / 2 triangle area: a * H /
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