CONSTRUCTION OF 60 DEGREE ANGLE:
In order to construct an angle of with the help of ruler and compasses only, we follow the following steps:
Steps of Construction
STEP I Draw a ray OA. STEP II With centre O and any radius draw an arc PQ with the help of compasses, cutting the ray OA at P. | |
STEP III With centre P and the same radius draw an arc cutting the arc PQ at R. | |
STEP IV Join OR and produce it to obtain ray OB. | |
The angle so obtained is the angle of measure . |
Justification : Now, let us see how this method gives us the required angle of .
Join PR. Now In we have OP = OR = PR [PR is an arc equal to radius] is an equilateral triangle. |
CONSTRUCTION OF AN ANGLE OF
In order to construct an angle of by using ruler and compasses only, we follow the following steps:
Steps of Construction
STEP I Draw a ray OA. STEP II With O as centre and any convenient radius, draw an arc PQ cutting OA at P. | |
STEP III With P as centre and the same radius draw an arc, cutting the arc PQ at R. Then taking R as centre and the same radius draw an arc cutting the arc PQ at S. | |
STEP IV Join OS and produce it to any point B. | |
so obtained is the angle of measure |
Which of the following step is Incorrect to construct an angle of as shown in the figure below: | |||
Right Option : D | |||
View Explanation |
The measure of an acute angle is________ | |||
Right Option : A | |||
View Explanation |
Arrange the following steps in a correct order to construct a 600 angle as shown in the figure: Step 1: Taking P as centre and with the same radius as before, draw an arc intersecting the previously drawn arc at point R. Step 2: Join OB which is the required ray making 600 with line OA. Step 3: Draw a line segment OA. Step 4: Now, taking O as centre and with a convenient radius, draw an arc of a circle which intersects line OA at P. | |||
Right Option : C | |||
View Explanation |
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