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LINES AND ANGLES

LINES AND ANGLES

INTEGERS

PERIMETER AND AREA

In the given figure identify:
(i) Five pairs of adjacent angles.
(ii) Three linear pairs.
(iii) Two pairs of vertically opposite angles

In the given figure identify:
(i) Five pairs of adjacent angles.
(ii) Three linear pairs.
(iii) Two pairs of vertically opposite angles

Replace the blank with an integer to make it a true statement.
(a) (−3)×___=27
(b) 5×___=−35
(c) [___]×(−8)=−56
(d) [___]×(−12)=132

ΔABC is right angled at A (Fig 11.25). AD is perpendicular to BC. If AB=5cm,BC=13 and, find the area of ΔABC Also find the lenght of AD.

Fill in the blanks:(i) If two angles are complementary, then the sum of their measures is _______.(ii) If two angles are supplementary, then the sum of their measures is ______.(iii) Two angles forming a linear pair are _______________.(iv) If two adjacent angles are supplementary, they form a ___________.(v) If two lines intersect at a point, then the vertically opposite angles are always_____________.(vi) If two lines intersect at a point, and if one pair of vertically opposite angles areacute angles, then the other pair of vertically opposite angles are __________.

In the given figure, AB is a diameter, O is the center of the circle and ∠OCB=50∘ then find ∠DBC.

Define the following terms :
(i) Angle
(ii) Interior of an angle
(iii) Obtuse angle
(iv) Reflex angle
(v) Complementary angles
(vi) Supplementary angles

संलग्न आकृति में निम्नलिखित कोण युग्मों को नाम दीजिए :
(i) शीर्षाभिमुख अधिक कोण
(ii) आसन्न पूरक कोण
(iii) समान संपूरक कोण
(iv) असमान संपूरक कोण
(v) आसन्न कोण जो रैखिक युग्म नहीं बनाते हैं ।

Adjacent Angle| Linear Pair Angle| Vertically Opposite Angle| Examples

Fill in the blanks:(i) If two angles are complementary, then the sum of their measures is _______.(ii) If two angles are supplementary, then the sum of their measures is ______.(iii) Two angles forming a linear pair are _______________.(iv) If two adjacent angles are supplementary, they form a ___________.(v) If two lines intersect at a point, then the vertically opposite angles are always_____________.(vi) If two lines intersect at a point, and if one pair of vertically opposite angles areacute angles, then the other pair of vertically opposite angles are __________.

In the adjoining figure, name the following pairs of angles.(i) Obtuse vertically opposite angles(ii) Adjacent complementary angles(iii) Equal supplementary angles(iv) Unequal supplementary angles(v) Adjacent angles that do not form a linear pair

Consider the following statements: when two straight lines intersect:
(iii) opposite angles are equal
(iv) opposite angles are supplementary

Consider the following
statements:
When two straight lines
intersect: