Which statements are true about the unknown side length in this right triangle? Check all that apply. A triangle with side StartRoot 13 EndRoot meters and hypotenuse of 6 meters. The equation a squared + (StartRoot 13 EndRoot) squared = 6 squared can be used to find the unknown length. The equation (StartRoot 13 EndRoot) squared + b squared + 6 squared can be used to find the unknown length. The equation (StartRoot 13 EndRoot) squared + 6 squared = c squared can be used to find the unknown length. The length of the unknown leg is StartRoot 23 EndRoot meters. The length of the unknown leg is 7 meters.