Know the perimeter of the triangle is 14.13, how to calculate the area

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• 1. Written in C # language, it is required to declare the triangle class, inherit the graphic abstract class, and calculate the perimeter and area of the triangle!
• 2. If the perimeter of a triangle is 12, and the three sides a, B, C have the following relations, C = B-1, B = A-1, then the area of the triangle is______ ．
• 3. What is the perimeter of the triangle with an area of 30 mu? Add: is any triangle, can you calculate it?
• 4. In Java, input the length of the three sides of the triangle from the keyboard to judge whether it forms a triangle. If it can, calculate the face of the triangle
• 5. In the known triangle ABC, a = 8, B = 7, angle B = 60 °, it is your great God to find the edge C and the area of triangle ABC
• 6. Java input three sides of the triangle, judge whether it is a triangle, triangle shape Java language to achieve this topic: input three sides of the triangle to determine whether equilateral triangle, isosceles triangle, unequal triangle;
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• 13. The area formula of trapezoid is s = 2 / (a + b) H. if the lower base B = 25, height h = 12 and area s = 240 are known, the value of upper base a can be obtained
• 14. If the side lengths a and B of the triangle ABC are two of the equations X & sup2; - 2 √ 3x + 2 = 0, and the area of the triangle ABC is √ 3 / 2, the third side C is obtained
• 15. In the triangle ABC, a and B are its two sides, and S is the area of the triangle ABC. If s = 1 / 4 (a ^ 2 + B ^ 2), then the shape of the triangle ABC is?
• 16. Draw the largest triangle on a rectangle 8.4cm long and 5cm wide. What is the area of the triangle in square centimeters
• 17. What is the area of a rectangle 9 long, 7 wide and a triangle bottom 10?
• 18. The bottom of a triangle is fixed, its height is proportional to its area, the perimeter of a rectangle is fixed, and its length is proportional to its width
• 19. On a piece of rectangular paper 20 cm long and 12 cm wide, cut out the largest triangle. The bottom of the triangle is () cm, the height is () cm, and the area is () cm
• 20. If the base of a triangle increases by 10% and the height decreases by 10%, the area of the triangle () A. Increase by 0.5% B. decrease by 1% C. increase by 1% d. no change