7. Parallel Straight lines
Instructions You have to write Do these slides on Exercise 7.1 your mathematics Exercise 7.2 writing book
Stra Straigh ight t lin line se e segm gment ent T he two end points of the straight line segment The portion AB of the straight line l is defined as the straight line segment AB .
Pa Paral rallel lel strai straigh ght t lin lines es Two straight lines which do not intersect each other are called parallel The straight lines p and q do not intersect each other. Due to that the two straight lines p and q are parallel
Pa Paral rallel lel strai straigh ght t lin lines es Two straight lines which do not intersect each other are called parallel a b The straight lines a and b do not intersect each other. Due to that the two straight lines p and q are parallel
How How ind indica icate both te both lin lines a es are re Pa Paral rallel lel to eac to each othe h other To indicate both lines are parallel to each other, arrowheads are drawn on the straight lines in the same direction.
Sometimes not only the two line but also several lines, we have to indicate as parallel to each other, at that situation we also drawn arrowheads on the straight lines in the same direction.
Pe Perpe rpendic ndicular ular dis distan tance ce 1. The perpendicular distance from a point to a straight line The shortest distance from a point to a line define as perpendicular distance between straight line
consider the A point and m straight line segment, It have marked several A distance between line m and point A m Q P R
consider the A point and m straight line segment, A AP repesent the shortest dintance between line and point Due to that AP is the m perpendicular distance Between line m and P point P
Pe Perpe rpendic ndicular ular dis distan tance ce 2. The perpendicular distance between two parallel straight line The shortest distance from a point to a line define as perpendicular distance between straight line
The perpendicular m distances from the two P points A and B that lie on the line l to the Q l straight line m are equal to each other. A That is, B AP = BQ
a R The perpendicular distances from the two points C and D that lie on S the line a to the straight line b are unequal to each other. b That is, C CR = DS D
Write down the names of five objects that can be observed in the classroom that have parallel edges. 1. 2. 3. 4. 5.
Do Exercise 7.1
Drawing parallel lines using a straight edge and a set square
Drawing a straight line parallel to a given straight line using a straight edge and a set square Do Activity 3 from the text book while watching today(2020.04.27) video lesson
Dr Drawin awing a g a st straigh raight t li line ne pa parallel rallel to to a a gi give ven n st straig raight ht li line, ne, th thro rough ugh a a po point int wh whic ich is h is no not t on th on the st e straig raight ht li line, u ne, using sing a a st straigh raight e t edge dge and a an d a se set sq t squa uare re Do Activity 4 from the text book while watching today(2020.04.27) video lesson
Drawing a line parallel to a straight line at a given distance from the straight line, using a ruler and a set square Do Activity 5 from the text book while watching today(2020.04.27) video lesson
Examining whether two straight lines are parallel Do Activity 6 from the text book while watching today(2020.04.27) video lesson
Drawing rectilinear plane figures using a set square and a straight edge Do Activity 7 from the text book while watching today(2020.04.27) video lesson
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