Now we can use the Triangle Larger Angle Theorem to box in the width of the river, AB. Since m∠ Cm∠ ABD, the length of AB has to be greater than 35 yd.
b Any right triangle will be isosceles if one of the acute angles in the triangle is 45^(∘). Therefore, if we can measure an angle of 45^(∘) from C or D, then AC and DA will be the same length as the distance across the river, AB.
