Why are some right triangles considered special?

Special right triangles. A special right triangle is a right triangle with some regular feature that makes calculations on the triangle easier, or for which simple formulas exist. For example, a right triangle may have angles that form a simple ratio, such as 45-45-90. This is called an "angle based" right triangle.

a. and b.

Step-by-step explanation:

a. m∠JKH+m∠JKL=180°

b. m∠JKL+m∠JLK+m∠KJL=180°

c. m∠JKH=m∠JLK

d. m∠JKL+m∠JLK=90°