First, read the English article below.

To do this, draw the height from both top vertices. If you cannot form two right triangles because one side of the trapezoid is perpendicular to the base, just note that this side will have the same measurement as the height, and divide the trapezoid into one rectangle and one right triangle. Since these are opposite sides of a rectangle, they will be the same length. For example, if you have a trapezoid with a height of 6 cm, you should draw a line from each top vertex extending down to the bottom base. Label each line 6 cm. (This is the bottom side of the rectangle.) The length will equal the length of the top base (the top side of the rectangle), because opposite sides of a rectangle are of equal length. If you do not know the length of the top base, you cannot use this method. For example, if the top base of the trapezoid is 6 cm, then the middle section of the bottom base is also 6 cm. The formula is a2+b2=c2{\displaystyle a^{2}+b^{2}=c^{2}}, where c{\displaystyle c} is the length of the hypotenuse of the right triangle (the side opposite the right angle), a{\displaystyle a} is the height of the right triangle, and b{\displaystyle b} is the length of the base of the triangle. Make sure you plug in the side length of the trapezoid for c{\displaystyle c}. Plug in the height of the trapezoid for a{\displaystyle a}. For example, if you know the height of the trapezoid is 6 cm, and the length of the side (hypotenuse) is 9 cm, your equation will look like this:62+b2=92{\displaystyle 6^{2}+b^{2}=9^{2}} Then, subtract to isolate the b{\displaystyle b} variable. For example, if the equation is 62+b2=92{\displaystyle 6^{2}+b^{2}=9^{2}}, you would square 6 and 9, then subtract the square of 6 from the square of 9:62+b2=92{\displaystyle 6^{2}+b^{2}=9^{2}}36+b2=81{\displaystyle 36+b^{2}=81}b2=45{\displaystyle b^{2}=45} (For complete instructions on how to simplify square roots, you can read Simplify a Square Root.) The result will give you the value of the missing base of your first right triangle. Label this length... 

Now, please write a short abstract for it in Indonesian. Abstract:
Bagilah trapesium menjadi satu persegi panjang dan dua segitiga siku-siku. Tulislah pengukuran semua tingginya. Tulislah pengukuran panjang dari bagian tengah pada alas trapesium. Tulislah rumus Teorema Pythagoras untuk segitiga siku-siku pertama. Masukkan nilai-nilai segitiga pertama yang sudah diketahui ke dalam rumus. Kuadratkan nilai-nilai yang sudah diketahui dalam persamaan. Carilah akar kuadratnya untuk mencari nilai math>b</math>. Carilah panjang dari segitiga siku-siku kedua yang belum diketahui. Jumlahkan semua panjang sisi trapesium.