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When the radius of a circle is several centimeters, its circumference and area are equal
2 cm, the square of 2 is equal to the value of diameter 4
The diameter of a circle is 8 cm. Its radius is () and its circumference is () and its area is ()
The diameter of a circle is 8 cm, its radius is (4 cm), its circumference is (25.12 cm), and its area is (50.24 cm 2)
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Find the circumference and area of a circle whose diameter is 10 cm
The circumference of this circle: 3.14 × 10 = 31.4 (CM)
The area of this circle: 3.14 × (10 ￣ 2) 2 = 78.5 (cm2)
The diameter of a circle is 16 cm. Find its circumference and area
It's OK to use the formula. The square of the radius is = area 2 * pi * radius = perimeter. The rest should not be me
The diameter of a circle is 12 cm. Find the circumference and area The formula and the answer
Perimeter: 12 × 3.14 = 37.68cm
Area: 6 × 6 × 3.14 = 113.04 square centimeter
The diameter of a circle is 4cm. What is the circumference and area?
Circumference C = π d = 3.14 * 4 = 12.56 (CM)
Area: S = π R 2 = 3.14 * (4 / 2) 2 = 12.56 (square centimeter)
The diameter of a circle is 2cm. How to find the circumference and area
The radius is one centimeter
Perimeter = 2 * 3.14 * 1 = 6.28
Area = 3.14 * 1 ^ 2 = 3.14
How to calculate the perimeter and area of a regular n-polygon inscribed in a circle Given that the radius of a circle is r, find the perimeter and area of the inscribed regular n-polygon of the circle Please use the knowledge of junior high school.
In this way, the top angle of each triangle is 2 π / N, the waist length is r, and the side length of the regular polygon is X. the vertical line on the bottom edge of the isosceles triangle is made through the center of the circle
The radius of a circle is enlarged by a times, the diameter by several times, the perimeter by several times, and the area by many times
The radius, diameter, circumference and area of a circle are increased by a-times, a-times, a-times, a-times, a-times, respectively
The radius of a circle should be enlarged by three times, the circumference by several times, and the area by several times
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- 1. How to deal with such problems as how many times the radius of a circle, how many times its diameter, how many times its circumference and how many times its area? I will have the final exam tomorrow. Is there any formula?
- 2. The coordinates of the center P of a circle (- 2,5), and its radius is 6, then the origin of the coordinates is at point P
- 3. In the plane rectangular coordinate system xoy, let the image of quadratic function f (x) = x ^ 2 + 2x + B have three intersections with the two coordinate axes, and the circle passing through these three intersections is marked as C (I) find the equation of circle C; (II) set point a is a fixed point passed by circle C (its coordinates are independent of B). Ask whether there is a constant k such that the straight line y = KX + K and circle C intersect at points m, N, and | am | = | an |. If it exists, find the value of K; if not, please explain the reason
- 4. In the plane rectangular coordinate system, the distance from the point P (- 3, - 4) to the X axis is () and the distance from the point to the Y axis is
- 5. If the chord length of the straight line 2x-y + 1 = 0 and the section circle x? 2 + y? 2 = R? 2 is equal to 5, find the radius of the circle
- 6. It is known that the distance from point a (2m + 1,3m-5) to the x-axis is twice the distance from the point to the y-axis
- 7. It is known that m (x, y) is a set of inequalities where x is greater than or equal to 0, less than or equal to root 2, y is less than or equal to 2, and X is less than or equal to root sign 2Y If point a (root 2,1), then z = vector OM, the maximum value of point multiplication vector OA is
- 8. The function is equal to the root x + 4, and the value range of the independent variable x is
- 9. Given that ⊙ O1 and ⊙ O2 are circumscribed at point a, the radius of ⊙ O1 is r = 2, and the radius of ⊙ O2 is r = 1, then the circle with radius 4 has () A. 2 B. Four C. Five D. 6
- 10. Given that the length of a chord is equal to the radius r, find: (1) The length of the inferior arc to which the string is directed; (2) The area of the bow formed by this chord and minor arc
- 11. As shown in the figure, it is known that AB is the diameter of ⊙ o, AC is the chord, and bisection ⊥ bad, ad ⊥ CD, and the perpendicular foot is d Proof: CD is tangent of ⊙ o
- 12. As shown in the figure, in △ ABC, D is a point on AC, e is a point on CB extension line, and AC BC＝EF DF， Confirmation: ad = EB
- 13. As shown in the figure, the straight line DF intersects with AB and AC on both sides of △ ABC at two points D and e respectively, and intersects with the extension line of BC at point F, ∠ B = 50 °, 1 = 76 °, f = 3
- 14. In the RT triangle ABC, the angle ABC = 90 degrees, the circle O with the diameter of AB intersects AC with D, and the tangent passing through D intersects BC with e. it is proved that de = 1 / 2 BC, If Tan angle c = root 5 divided by 2, de = 2, find ad
- 15. As shown in the figure, it is known that AB is the chord of ⊙ o, the radius OA = 20cm, ∠ AOB = 120 ° and the area of ⊙ AOB is obtained
- 16. As shown in the figure, the diameter of ⊙ o is ab = 10, C and D are two points on the circle, and AC＝ CD＝ Let the tangent ed of point d cross the extension line of AC at point F. connect OC to ad at point G (1) Confirmation: DF ⊥ AF (2) Seek the length of OG
- 17. It is known that, as shown in the following four graphs, circle O1 and circle O2 intersect at two points a and B, the line CD passing through point a intersects with circle O1 at C, intersects with circle O2 at D, and straight line ef? 2 passing through point B As shown in the following figure, circle O1 and circle O2 intersect at two points a and B, the line CD passing through point a intersects with circle O1 at C, and with circle O2 at D. the line EF passing through point B intersects with circle O1 at e and circle 02 at F, so as to verify CE ∥ DF Picture in space photo album
- 18. Given that AB and CD are two diameters of circle O, chord CE / / AB, angle COE = 50 degrees, then the acute angle DOB =?
- 19. It is known that: as shown in the figure, take the oblique edge ab of RT △ ABC as the diameter to make ⊙ o, and D is the point on ⊙ o, and there is AC = CD. Pass through point C to make the tangent of ⊙ o, and connect CD with the extension line of BD at point E (1) Try to judge whether be and CE are perpendicular to each other, please explain the reason; (2) If CD = 2 5，tan∠DCE=1 2. Find the radius length of ⊙ o
- 20. As shown in the figure, the radius of ⊙ o is 3cm, point B is a point outside ⊙ o, OB intersects ⊙ o at point a, and ab = OA, starting from point a, the moving point P moves anticlockwise on ⊙ o at the speed of π cm / s, returns to point a and stops immediately A. 1 B. 5 C. 0.5 or 5.5 D. 1 or 5