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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:

(i) adjacent angles are complementary

(ii) adjacent angles are supplementary

(iii) opposite angles are equal

(iv) opposite angles are supplementary

Consider the following

statements:

When two straight lines

intersect:

(i)adjacent angles are complementary

(ii)adjacent angles are supplementary

(iii)opposite angles are equal

(iv)opposite angles are supplementary

Of those statements which is correct

ਨਾਲ ਦਿੱਤੀ ਅਕ੍ਰਿਤੀ ਵਿਚ ਹੇਠਾਂ ਦਿੱਤੇ ਕੋਣਾਂ ਦੇ ਜੋੜਿਆ ਦੇ ਨਾਮ ਲਿਖੋ:- ਲਾਗਵੇਂ ਪੂਰਕ ਕੋਣ

संलग्न आकृति में निम्नलिखित कोण युग्मों के नाम दीजिए :

आसन्न पूरक कोण