How much is a triangle divided by a circle equal to 3? How much is a triangle minus a circle equal to 12

The triangle is 18 and the circle is 6

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1. Given that circle plus circle = 90, triangle times circle equals 90, square divided by triangle equals 90, then how much is square equal to? The volume of a cylinder is 6.28 cubic decimeters larger than that of a cone with the same base and height. What is the volume of a cone?
2. How does a square plus a triangle equal 10? How does a square minus a triangle equal 9?
3. A square minus triangle is equal to 10, three triangles are equal to a square, find the square is equal to (?), find the triangle is equal to (?)?
4. A triangle multiplied by a square equals a circle. Three triangles equals a circle minus two triangles
5. Circle plus triangle equals 72, triangle plus square equals 63, square plus circle equals 81, what is circle equal to
6. Circle times square equals triangle, circle plus circle equals triangle minus circle minus circle, what are circle, triangle and square?
7. Triangle minus square plus triangle minus square equals 72 triangle minus square minus square equals 27 triangle equals how many squares equals
8. The sum of triangle, square and circle is 32, triangle minus 3 equals circle, triangle divided by 2 equals square, how many are they?
9. It is known that in RT triangle ABC, the angle c is equal to 90 ° and if a is equal to 15 and B is equal to 20, the value of C is obtained
10. In RT triangle ABC, the angle c is equal to 90 degrees, 1, B = 4, C = 7, a 2, B = 16, a: C = 3:5, a, C
11. Triangle divided by circle equals 3, triangle minus circle equals 4, triangle equals how much? Circle equals how much?
12. 1 star plus 2 triangles plus 3 squares equals 18, 1 star plus 3 triangles plus 3 squares equals 24, how many triangles is it?
13. Square 7 equals 24 Triangle, the biggest triangle is (), and the square is ()
14. In a triangle, an angle = 30 ° and the opposite side is equal to half of the other side. Find out if the triangle is a right triangle
15. Prove that the side opposite the 30 degree angle is equal to half of the third side, then the triangle is a right triangle How can I spell 60 degrees
16. If an angle of a triangle is 30 degrees and the corresponding side of an angle is half of the other side, is the triangle a right triangle?
17. In a triangle, if an acute angle equals 30 degrees and one side equals half of the other side, it is proved that it is a right triangle
18. As shown in the figure, which two straight lines are cut by which one respectively for ∠ 1 and ∠ 2, ∠ 3 and ∠ 4? What are their angles?
19. As shown in the figure, which two straight lines are cut by which one respectively for ∠ 1 and ∠ 2, ∠ 3 and ∠ 4? What are their angles?
20. As shown in the figure, which two straight lines are corner one and corner two, corner three and corner four cut by which one? What angles are they?