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?

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• 1. 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
• 2. 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
• 3. Square 7 equals 24 Triangle, the biggest triangle is (), and the square is ()
• 4. 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?
• 5. Triangle divided by circle equals 3, triangle minus circle equals 4, triangle equals how much? Circle equals how much?
• 6. How much is a triangle divided by a circle equal to 3? How much is a triangle minus a circle equal to 12
• 7. 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?
• 8. How does a square plus a triangle equal 10? How does a square minus a triangle equal 9?
• 9. 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 (?)?
• 10. A triangle multiplied by a square equals a circle. Three triangles equals a circle minus two triangles
• 11. 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
• 12. 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?
• 13. 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?
• 14. 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?
• 15. Place the cube dice (the number of points on the opposite side is 1 and 6, 2 and 5, 3 and 4 respectively) on the horizontal table top, as shown in Figure 1. In Figure 2, roll the dice 90 ° to the right, and then rotate it 90 ° counterclockwise on the table top to complete a transformation. If the initial position of the dice is shown in Figure 1, the number of points on the upper side of the dice after 10 consecutive transformations according to the above rules Yes () A. 6B. 5C. 3D. 2
• 16. As shown in the figure, in the square grid of 4 * 4, what is the size relationship of ∠ 1, ∠ 2, ∠ 3?
• 17. As shown in the figure, in the square grid, the tangent value of ∠ AOB is___ ．
• 18. In the square grid, ∠ AOB is placed as shown in the figure, then sin ∠ AOB = () A. 55B. 255C. 12D. 2
• 19. Fill 3,0,6,9 in the square so that the sum of the three numbers in the horizontal, vertical and oblique squares is equal to 15,12,9,6,3
• 20. Use - 2. - 1.0.1.2.3.4.5.6. Nine numbers are horizontally, vertically and obliquely in nine squares. The sum of three numbers equals Is there any rule in this kind of calculation