Assertion: triangle's side | /r/CapableOf | form right angle
Facets:
Source sentences:
text: If all the three angles are acute ( Fig.20 ), then this triangle is an acute-angled triangle; if one of the angles is right ( C, Fig.21 ), then this triangle is a right-angled triangle; sides a, b, forming a right angle, are called legs; side c, opposite to a right angle, called a hypotenuse; if one of the angles is obtuse ( B, Fig.22 ), then this triangle is an obtuse-angled triangle.
text: The area of a right triangle is half the product of the two sides that form the right angle (cathetus
text: Its area will then be half the product of the two sides that form the right angle (cathetus