analyse
Given the base and height of a triangle, find the area of the triangle, multiply the height by the length of the base of the triangle, and then divide the product by 2.
Two identical triangles can form a parallelogram.
The parallelogram with equal base and equal height has the same area; The area of a triangle with equal base and height is equal.
The area of a parallelogram with equal base and equal height is twice that of a triangle.
If a triangle and a parallelogram have the same area and the same base, the height of the triangle is twice that of the parallelogram.
If the area and height of triangle and parallelogram are equal, the base of triangle is twice that of parallelogram.
Similar triangles determine:
1, three sides corresponding to two triangles are equal, and two triangles are congruent, which is called "side" or "SSS" for short.
2. The two sides corresponding to two triangles and their included angles are equal, and the two triangles are congruent, which is called "corner edge" or "SAS" for short.
3. The two angles and sides corresponding to two triangles are equal, and the two triangles are congruent, which is called "angle" or "ASA" for short.
4. The two angles corresponding to two triangles are equal to the opposite sides of an angle, and the two triangles are congruent, which is called "corner edge" or "AAS" for short.
5. One hypotenuse and one right-angled side corresponding to two right-angled triangles are equal, and the two right-angled triangles are congruent, which is called "hypotenuse, right-angled side" or "HL" for short.