## Elements of Geometry and Trigonometry |

### From inside the book

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Page 10

When two straight lines , AB , AC , meet each other , their inclination or opening is called an angle , which is ... Every angle BAC , less than a

When two straight lines , AB , AC , meet each other , their inclination or opening is called an angle , which is ... Every angle BAC , less than a

**right angle**, is an acute angle ; and every angle DEF , greater than a**right angle**... Page 11

A right - angled triangle is one which has a

A right - angled triangle is one which has a

**right angle**. The side opposite the**right angle**is called the hypothenuse . Thus , in the triangle ABC , right - angled at A , the side BC is the hypothenuse . B 17. Page 13

All

All

**right angles**are equal to each other . 11 From one point to another only one straight line can be drawn . 12. Through the same point , only one straight line can be drawn which shall be parallel to a given line . 13. Page 14

If one straight line meet another straight line , the sum of the two adjacent angles will be equal to two

If one straight line meet another straight line , the sum of the two adjacent angles will be equal to two

**right angles**. E Let the straight line DC meet the straight line AB at C , then will the angle ACD + the angle DCB , be equal to ... Page 15

From the point C draw the line CF , making with AC the

From the point C draw the line CF , making with AC the

**right angle**ACF . Now , since ACD is a straight line , the angle FCD will be a**right angle**( Prop . I. Cor . 1. ) ; and since ACE is a straight line , the angle FCE will likewise be ...### What people are saying - Write a review

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### Common terms and phrases

ABCD adjacent altitude base become Book called centre chord circle circumference circumscribed common cone consequently contained Cosine Cotang cylinder described determine diameter difference distance divided draw drawn equal equations equivalent expressed extremities faces feet figure follows formed four frustum give given gles greater half hence homologous hypothenuse included inscribed intersection less let fall logarithm manner means measured meet middle multiplied number of sides opposite parallel parallelogram pass perpendicular plane polygon prism PROBLEM Prop proportional PROPOSITION pyramid quadrant quantities radii radius ratio reason rectangle regular remaining right angles Scholium segment sides similar Sine solid solid angle sphere spherical triangle square straight line suppose taken Tang tangent THEOREM third triangle triangle ABC unit vertex whole