Similar arguments yield the base angles of ? " BXZ " and ? " CYX " and all the angles in the figure can now be easily determined.
12.
A student at this level might say, " Isosceles triangles are symmetric, so their base angles must be equal . " Learners recognize the relationships between types of shapes.
13.
The base angles are very nearly right angles and would need to be measured with much greater precision than the parallax angle in order to get the same accuracy.
14.
It takes similar requirements to get into the fly-tying class, offered in a dank camp classroom the first Monday of the month by members of the Sierra Pacific Flyfishers, a San Fernando Valley-based angling club.
15.
Since = =, " OBA and " OBC are isosceles triangles, and by the equality of the base angles of an isosceles triangle, " OBC = " OCB and " BAO = " ABO.
16.
This identity is quite useful in conjunction with the recursive generating formula, inasmuch as it enables one to calculate the cosine of any integral multiple of an angle solely in terms of the cosine of the base angle.
17.
The base angles of an isosceles trapezoid are equal in measure ( there are in fact two pairs of equal base angles, where one base angle is the supplementary angle of a base angle at the other base ).
18.
The base angles of an isosceles trapezoid are equal in measure ( there are in fact two pairs of equal base angles, where one base angle is the supplementary angle of a base angle at the other base ).
19.
The base angles of an isosceles trapezoid are equal in measure ( there are in fact two pairs of equal base angles, where one base angle is the supplementary angle of a base angle at the other base ).
20.
The base angles of an isosceles trapezoid are equal in measure ( there are in fact two pairs of equal base angles, where one base angle is the supplementary angle of a base angle at the other base ).
