...other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle. An obtuse angle is one which is greater than a right angle. in the same plane, and which, being produced 12. Parallel straight lines are such as are 13. A plane...

...sides beyond the vertex, be equal to it. 7. An ACUTE ANGLE is one which is less than a right angle. 8. An OBTUSE ANGLE is one which is greater than a right angle. Therefore, angles are of three kinds: — right, acute, and obtuse. 9. A PLANE TRIANGLE is a. figure...

...a risht angle. CE AM An acute angle is one which is less than a right angle, as the angle CBE ; and an obtuse angle is one which is greater than a right angle, as the angle ABE. § 37§. One straight line is perpendicular to another when they form a right angle...

...is a right angle. Ji An acute angle is one which is less than a right angle, as the angle CBE; and an obtuse angle is one which is greater than a right angle, as the angle ABE. § 379. Two straight lines are parallel to each other when they are everywhere equidistant...

...be perpendicular to each other. XIII. An Acute angle is one which is less than a right angle. XIV. An Obtuse angle is one which is greater \ than a right angle. XV. When the sum of two angles is equal to a right angle, they are called Complementary angles ; each...

...other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle. An obtuse angle is one which is greater than a right angle. 12. Parallel straight lines are such as are in the same plane, and which, being produced ever so far...

...be perpendicular to each other. XIII. An Acute angle is one which is less than a right angle. XIV. An Obtuse angle is one which is greater \ than a right angle. XV. When the sum of two angles is equal to a right angle, they are called Complementary angles ; each...

...as the angle CAB. B D 16. An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF. An OBTUSE ANGLE is one which is greater than a right angle ; as the angle EFG. E< -G B D Acute and obtuse angles have their sides oblique to each other, and are...

...CAB. -B, D 16. An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF. E' E. B D An OBTUSE ANGLE is one which is greater than a right angle ; as the angle EFG. x G Acute and obtuse angles have^ their sides oblique to each other, and are sometimes...

...angle; or of the sum of two angles to say that it is equal to the sum of two right angles. Def. 13. An obtuse angle is one which is greater than a right angle. THEOREM 2. From a given point outside a given straight line of indefinite length one perpendicular,...